Took photo with my phone and ran into trouble with file size...anyway i have 2 Howard dragons ..one of which stripped for a gearbox repair hence the photo with engine removed. Its a while since i took it apart but from memory the side panel is removed , the clutch is bolted on with two bolts onto the side of the gearbox, and onto the front mechanism. Those clutch cables are of course hens teeth. Your one looks a lovely machine , my good one was used for landscaping and while still working is battle scarred. The one in the photo i posted a few years back on the VHGMC forum...i bought it minus the rotor box.. a non runner with a gearbox issue. Amazingly i met an ex Howard employee at a vintage show in 2019 and he had a dragon gearbox and a gear change cable ...he worked for Howards Ireland operation (Closed in 1982)..the gearbox he had was replaced under warranty ,so was damaged .... but had the bits i needed.