Just started to restore / rebuild a mini , decided to go down the route of a rollover frame / rotisserie
looking online at various sites and the cost i thought i would make one myself. Stage 1
I work in the construction industry and we use key clamp all the time for barriers etc
you can buy various dia and sizes with key connections that can be a tee or am elbow mid sections plus loads more
Type in Key clamp in a search engine and you will find loads.
I have made adjustable A frames out of this with 48mm dia galv 3m long tube which is the same size as scaffolding, the idea i had was to make these reusable for any other future projects, so you can adjust the height if required by moving the flat bar into the holes drilled. The clamps have a allen key lock screw which clamps the tube so it make the frame ridged. You can adjust the clamp screws at the top so that it pivots to another height and re position the flat bar the re lock the screws/ bolts.
i will be adapting 2 mini R56 wheel hubs for the rotation device with some tube welded to the hub or some additional tube which passes thru the fittings with some holes drilled to allow rotation and then a bolt as a pin to hold the car in position dependant on the number of holes you drill.
You can put a dia bar straight thru the mini of make some h frame and connect to the mini at the engine sub frame and rear seat / parcel shelf.
this cost £85 for all the components with some left and took me less than 1 hour to cut and make no need for welding.