Looks pretty good to me. Only comment i'd make would be find a 6th slot for flaming arrow and ranged shot (another recred or a range in flaming and a second intred in ranged), one of the slots from aid other and the endred from aimed shot would probabley be the safest.
With regards to fly/hover binds google for citybinder - its a neat little applet that sets up all sorts of movement binds for you with a helpful tickbox interface so you can get it set up how you like. I tried it with my blapper but it had a number of drawbacks, the constant queuing of movement powers can interfere with trying to use aim/build up while moving (say your flying along, hit build up whilst coming to a halt, fly cancels while build up is still firing so you end up dropping a bit until hover can execute) and it plays merry hell with jousting in pvp - especially if you use the auto-sprint function. The binds can get messed up sometimes too, but there is a reset binds button. Its impressive stuff but i found it meant i wasn't fully in control of my character, which was a shame because automatically cutting to hover really makes it easier to get into position and fire a snipe without it interrupting.
Union 50s:
Crimson Cannon: NRG/NRG/Force
Tara Thorn: Archery/NRG/Elec
Damatria: BS/SD/Body
Defend the Earth from Aliens in my MA Arc: ID:57186
I got the same powersets and thus i can hopefully I'am somewhat experienced with these.
A nice build, though as far as I can judge, you could run out of endurance real quickly. So I would go for stamina so you can use the slots for dmg and accuracy(A blasters main weapon 
), but every players has his owh playingstyle. I played without stamina before my first respec and had to slot it heavily with endurance reduction to make sure I wouldn't run out of endurance in the longer fights, but I think you will do fine when solo'ing since there are less crowds and more time to take a rest.
The only way to find out; Try it :P
Well, I've had no probs with end at all. Well, the only toggle I run is combat jumping, and occasionally if I know there's a long fight ahead I'll pop Conserve Power, just to make sure I don't run out in the first place. Still not decided on slots, might not have heals in medicine powers, as I'll probably be using them with power boost for doubled numbers anyway, not sure. Just gunna slot for a little interrupt reduction, maybe a recharge, and possibly an end red in Aid Self, as it seems to cost a little more. However, I'm currently in the leaping pool, so my only toggle is cheapo, will this change if I hover instead? It's not that much more, but should I put an end red in it? I'll probably have 3x Flight Speed. And I will have 3 damage in all attacks 
Exported from version 1.5C of CoH Planner
The point is, have I made any mistakes? I'm going to end up being mostly a ranged character, hovering far from the battlefield, blasting away whilst Boost Ranged, and either running in sometimes for a nice total Focus/Bone Smasher Combo, Or save it for approaching enemies on the tough mishes. I'm deciding to go for fly because of all this hoversniping etc stuff I'm hearing about, and I've got to ask this too, slightly off topic, but are there any good hover/fly switching keybinds I could use? Better yet, one of the ones that switches to fly while I have a direction down? I'm saying this, as I obviously don't want to fly for whole battles, as it'd be too costly, but I want the hight protection.
http://joechott.com/coh
Archetype: Blaster
Primary Powers - Ranged : Archery
Secondary Powers - Support : Energy Manipulation
01 : Power Thrust acc(01)
01 : Aimed Shot acc(01) dam(3) dam(7) dam(25) endred(37)
02 : Fistful of Arrows acc(02) dam(3) dam(7) dam(17)
04 : Build Up recred(04) recred(5) recred(5)
06 : Hover fltspd(06) fltspd(9)
08 : Flaming Arrow acc(08) dam(9) dam(11) dam(25) recred(34)
10 : Bone Smasher acc(10) dam(11) dam(13) dam(15) endred(46)
12 : Explosive Arrow acc(12) dam(13) dam(15) dam(17) endred(40)
14 : Fly endred(14) fltspd(36) fltspd(37) fltspd(37)
16 : Conserve Power recred(16) recred(46) recred(46)
18 : Ranged Shot acc(18) dam(19) dam(19) dam(23) inttim(23)
20 : Aim recred(20) recred(21) recred(21)
22 : Aid Other inttim(22) hel(31) recred(42) hel(43)
24 : Aid Self inttim(24) hel(31) recred(31) endred(43) hel(43)
26 : Hasten recred(26) recred(27) recred(27)
28 : Power Boost recred(28) recred(29) recred(29)
30 : Super Speed endred(30)
32 : Rain of Arrows acc(32) dam(33) dam(33) dam(33) endred(34) recred(34)
35 : Boost Range recred(35) recred(36) recred(36)
38 : Total Focus acc(38) acc(39) dam(39) dam(39) dam(40) endred(40)
41 : Body Armor damres(41) damres(42) damres(42)
44 : Cryo Freeze Ray acc(44) acc(45) hlddur(45) hlddur(45)
47 : LRM Missile acc(47) acc(48) dam(48) dam(48) dam(50) recred(50)
49 : Stealth endred(49)
-------------------------------------------
01 : Brawl Empty(01)
01 : Sprint Empty(01)
02 : Rest Empty(02)
Well, this is my build so far. Or, what I'll be respeccing into tomorrow. I've hit 24 and I'm soloing and teaming pretty smoothly. End's not been a problem without stam, except for a couple of interrupted snipes in a row or whatever. Anyway, I will not accept flames saying that a weapon set cannot blap. This is by no means true. Heck, I'm even planning munitions mastery. Just to add to the weaponage.
I've taken medicine pool as some self defence, and I've gotta say, already, it's saved my life. Very handy self heal, and I intend to use it with power boost too. How much downtime does boost range have by the way, when 3 slotted? I'm just curious.
Any major mistakes, please point them out. I'm tired