Some ingenious techniques I've heard of:
- lay the tools out on a sheet of glass, with marks on the corners, place a bright light underneath casting a sharp shadow on a clean white surface --- photograph this --- place the photograph in Photoshop, distort it until the marks line up with their known dimensions
- place the tools on a sheet of paper, make a tool which is a pointed piece of wood with a recess along the tip to hold a ball point pen refill --- the wood will hold the pen refill vertically, and the point of it will allow the marks to very closely approximate the tool
- place the tools on a gridded background (a cutting mat works well), photograph them, place the photo in a drawing program, and line it up so that the grid is square and the correct size, place the image on a background and re-draw --- that's the technique I used for:
https://cutrocket.com/p/5bdcd4e31c403/
- find or make 3D models of the tools and arrange them in a modeling program --- I used that for:
https://www.pinterest.com/pin/379709812305098767/ (drew up the tools in OpenSCAD)
I'm seriously considering just putting the tools on the lid of a box on top of a thin layer of foam, draping them with a cut open T-shirt, putting the box on top and then spraying expanding foam into the box.