Getting the thickness is the only thing I couldn't do using hand tools, the rest can be achieved with a coping saw/file/sandpapers.
I got a joinery firm to make some blanks, I gave him £20 and he gave me 24 150mm x 30mm x 3.6mm of hardwood. I did make quite a few mistakes I think it was my third attempt that I finally got it right, so make sure you get spares.
The biggest issue with using hand tools is drilling the holes, trying to get them perpendicular to the wood is hard you need to make a guide for the drill or preferably find someone with a tabletop drill.
When life gets you down don't put on a frown, take out that razor and cut a smile