@Andy B - looks goods - one suggestion - your angle iron - could you fix it diagonally across the middle of the bar stool swivel plate? Then you will have perfect rotation around the centre, instead of it being offset.Yep, it’s the Evolution stand.
The plates are heavy duty barstool swivel plates:
https://www.amazon.co.uk/dp/B076CD9...imm_5ND4V2R8Y2JA9CF9N073?_encoding=UTF8&psc=1
The uprights are 30mm square rolled steel from B&Q and fit snug in the saw stand. I bought a 2.5m length and chopped it in half:
https://www.diy.com/departments/var...be-l-2-5m-w-30mm-t-1-5mm/3232637200004_BQ.prd
M6 coach bolts, washers and nuts. 45mm length for attaching plates to uprights. 16mm length for attaching angle iron (also from B&Q) to plates.
The Canadian Arcade YouTube video shows you how to set it up if you need instructions.