So I'm going back to the acrylic idea. 1/4" is more than thick enough to handle the weight of the rads. + I will have rad grills made to give it some more strength.
Here are some more pictures.
The new feet. I'm 100% sure these will keep it sanding.
And the cutouts for the rads.
I got replies for the aluminum and just having the main pieces cut will cost over $140 so alu is out.
I just sent some emails to plexi companies to get work done. Hopefully I'll have a reply tomorrow.
Cheers till then.