V8 Engine block

This is my first major design-build, so be kind would love some comments.
I took the inspiration from many different designs I have seen all over the web.

The pullies are all GT2 toothed pullies with 5mm bore.
the belts are standard belts (size to be added once I measure)

All screws are 0.8mm diameter thread (more details to follow)

The drive space is a 3v gearbox motor that mounts into the supercharger, this can be linked to your RC control to make the pullies move.

All bearings