One thing I have made to go with our tank open days is a gantry crane and some accessories.
The crane is a kids tower crane that I picked up from a charity shop, it was broken but this was fine as I always intended it be changed into a gantry crane. The feet are from an old toy the neighbours were throwing out-I of course liberated after asking first

The mobile generator is a old jeep chassis, cut and adapted, with old speaker boxes reutilised as the main housing, spares from the tank and other model parts from the bits-bins were used.
I found some of them CO2 cartridges and used them as welding bottles, the pipework is old plug fittings and some metal pins with a PIII small light as a gauge, the welding torch is the end of a bicycle pump adapter cut down, the flame is a small white wire with some epoxy mixed with Tamiya clear.
The two figures are in the same uniform so just a repaint and they serve as mechanics.
https://i.ibb.co/Jp73d6P/IMG-8881.jpg
https://i.ibb.co/xXbxqwv/IMG-8880.jpg
https://i.ibb.co/rsYsSQR/IMG-8879.jpg
https://i.ibb.co/0J72nw1/IMG-8875.jpg
https://i.ibb.co/j6sk7Q9/IMG-8871.jpg
https://i.ibb.co/dtZsp2y/IMG-8867.jpg
https://i.ibb.co/TkSRG3D/IMG-8870.jpg
https://i.ibb.co/tYxk1BY/IMG-8866.jpg
https://i.ibb.co/pLKtPyZ/IMG-8883.jpg
https://i.ibb.co/xqdDpR8/IMG-8755.jpg
https://i.ibb.co/sK5RxRF/IMG-8754.jpg
Si.