I think to slot a Hedlund v-twin engine in there is a good use of an old Featherbed. I like this one which was featured in the Swedish magazine "MCM" in the late '90s. The frame is a 1953 wideline which was taken out 20mm to accomodate the Hedlund. Forks and shocks are Marzocchi, rims are Akront, frontbrake is a Grimeca, rear is a Commando. Gearbox from Quaife. The production of the 1000cc Hedlund started in 1978, built by Swede Nisse Hedlund primarily for sidecar racing. 50 engines were built.