Well I re-made the footrest hanger plates from 10mm aluminium. Initially I positioned the footpegs as per the original Monster relative to the swinging arm pivot (c100mm behind, 75mm down) but ran into clearance issues with the exhaust on the RH side so I had to remake them and raise them by 20mm. Both are now about 40mm inboard of the original Monster position so ground clearance should not be an issue.
When I came to fit the gear linkage the pedal fouled the return spring on the side stand.
I was never happy with the side stand seemingly waving in the breeze so I decided to remake the side stand mounting bracket