Thank you Colin, happy that you like it.
For the dimensions, I can, like the drill or the bench measure the real thing and convert to scale, and I can also estimate the size by comparing it to the models motorcycles I have.
For example:
A little more woodworking
A little metallurgy: cutting of two 1mm thick brass washers:
then a little cutting:
And finally added on their perimeter a brass strip always 1mm and welded.
The gray thing in the middle is a model maker’s grinding wheel
with its base, always made of wood, and the 0.5mm brass wall bracket
result - sorry, I should have removed the dust