Here are a few of my homemade tools, my most used one is the 1 inch by 4 inch sander, restored to a new condition with a new piece of sanding belt, stuck on the 3/16 balsa backplate with double sided tape, the previous bit gave me good service by doing the seaknight, jetranger and big wasp. Also shown is round sander, meccano drum sander and extended scalpel. The balsa bit is actually my instant compass, used for drawing the wasp abdomen rings. One of the best things about these tools is they are cheap, very cheap. Second pic shows my sanding centre, made from a motor from battery powered strimmer which had dead batteries and cordless drill with same problem. Both are powered from 12v sealed lead acid battery, surplus after changing my bike to li-ion powerpack. The sander is very effective, and really handy to have sitting ready.
Last photo shows one of my building/cutting boards, if you need a fresh cutting surface, open it up and choose a new pristine page. I have several of these on the go. Very useful.