Id prob stick with non turbo as ive yet to see a turbo 24v thats as quick as they claim, and a 24v on throttle bodies or carbs would sound mental!

1080kg is fookin good for std panels! Id deffo be going for fibreglass boot, bonnet, and doors, can get em for most sierras but duno bout doors for that shape one.
I presume its perspex windows all round barring the windscreen?