One thing you need to consider is changing the plugs, get the location wrong and its a weekend job to do them! also, you want to be careful where you put the wastgate (for similar reasons). Problem of heat should be alright with appropriate thermal sheilds etc. On my M30 turbo, my manifold is very close to the steering box, so much so that that side is shimmed slightly on the mount. The wastegate was originally up top but was moved to under the AC compresser as you could not get to the plugs.
Turbo looks sick! I reckon it WILL be like an on off switch, power wil hit and the rear will let loose in 2nd 3rd, forget trying to modulate the power, especially if your using a smaller stock type throttle body. I'll be watching this one, should be !! What CR are you planning on running?
Good luck.