Great instructions John!
Nice old jigsaw BTW. I have a weakness for older tools.
One bit of advice to anyone making one of these. Use a good quality plywood for your parts. Nasty old construction grade plywood is rough, has gaps in the layers and sometimes the layers aren't as well glued as you might like. While you can make it work, it will be frustrating. Far better to use at minimum sanded shop grade or better yet a smooth hardwood like birch or maple plywood that is intended for furniture or cabinets for the parts. You don't need much so spending a little extra for quality materials isn't a big deal. Many hardware stores sell 1/4 or 1/2 sheets of plywood for small projects.
If you're not sure what you need, just ask someone at the store.
Rodney