Wow really impressed with the build - I can only guess the costs involved on the whole project.
Out of interest can I ask why you didnt consider shoe horning a 3SGTE in the engine bay? Shorter block, so it would sit further back for better weight distribution. Easily modified and tuned for power. You culd hit 400 with nothing much more than some forgies, ECU, Injectors, suitable turbo and IC.
Would have probably been less hassle to get the power you want than the GE?
Still a turboed Beams engine will be very cool!
Good luck with it all!