Coooooooool......and people think I'm mad for riding the bike in my avatar picture..a 1974 Kawasaki H2-750 two-stroke triple..."the widowmaker"...
Seriously though, who makes them here? It looks awfully like the American bike the "Boss Hoss" which is now being imported. I didn't know anyone here was making anything with that sort of quality as seen in your pictures. Sure, we've all seen dodgy-looking home-made car-engined bikes, but that thing oozes quality. I especially like the tyre profile...they have a normal curving bike tyre cross-section profile instead of the flat car-like tread cross-section profile that a lot of the earlier Boss Hoss bikes had (and maybe still have...

) which means you could lean that bike into corners properly...erm...obviously not lean it too
far of course...
Well done, whoever built it!