This has been an interesting project to follow. Did you make that 5-string violin yourself?
Are those ukulele pegs on a ukulele neck? Did you carve the neck from scratch, or modify a prefab blank ukulele neck to make the thicknesses match?
I'm going to try making a very simple "cigar box" fiddle as a demo for a science project I'll be doing with some 6-8 year olds. (They'll make instruments from a tissue box and rubber bands, and I'll show how a few modifications will - hopefully - give a better sound with more options for choosing pitch.) Was thinking of just placing a violin fingerboard on top of a blank ukulele neck, but of course the neck will be wider than the fingerboard.
It will be great to see your fretted fingerboard in action!