No prob, happy to help :)

If you are undecided on which engine, just be aware that using an MT75 box will mean you have a slightly smaller drivers footwell, & the pedal box needs to be made to suit the available footwell space ;) , its not a problem, just needs to be thought about early in the build.

For the corner braces, just a small length of steel approx 6 inches or so with angles cut to fit will help brace the engine bay.

Best wishes for your build :cool:

cheers
andy