Just received this from Amazon Burntec PCB Holder £8.99 Feet and cross beam are metal with plastic brackets and clamps to hold the circuit board, a really nice piece of kit especially for under £9 Paul
Also think with some pieces of coat hanger wire it could make a good holder for painting loco bodies. The design is simple enough for some custom 3D prints, and some rectangular ally tube (shower rails sprint to mind), mmmmmmmm Paul