Once upon a time in the deep dark recesses of time there existed.................................pencil and paper. Pre-cad we all did are designs this way. Give it a go, it may still be available.
Lots of info here. It is also possible to get plans at a reasonable price and get some one to print them out for you for you to modify to suit your self.

Bruce

Of course you will eventually have to learn so that you can draw the components that you want to make.