Dude, did you buy three cars or just parts? I think it will be tight as hell to transform a 240 into a skyline cuz it is lighter, and smaller and with the same arsenal you might even keep up with them except for the little detail of the top notch AWD, which might be compensated with the weight saving.
Checkout the bottom of the posts
240 to r33 conversion , some guy was given a link to a dude in Florida with a 240 with an R33 conversion, it was tight.
Keep us posted with the pics.
By the way, would you consider selling the R33 lights and keeping the R34??????