Build your own Paul McCartney electric bass?

Hey, So, I'd really like to try to recreate Paul McCartney's violin electric bass. Unfortunately, I have no idea where to start or how to find the measurements (I've searched the internet and haven't found anything helpful). Also, the YouTube tutorials for building electric basses are pretty mediocre; they all just quickly show the process…

Crafting with concrete and foam blocks?

Hello everyone, I'd like to "model" a castle, and make it as realistic as possible. I'd use rigid foam blocks, cut/sand/shape them accordingly. Then I'd like to coat individual elements with concrete. Not just concrete paint, but actual concrete. Is that possible? Will the concrete stick to the surface? Or is there a similar option…