Looks like you've got a good combination of old and new going on there. I'll chime in with some of that Suntour love - I've got Mk II shifters/derailleurs on one of my favorites, and they work great (all the more so with a modern cassette). Scheming another Suntour-heavy build, too. Great stuff.

When I caught your username, prior to scrolling to the mention of a dirt bike incident, I was worried that the damage had been done in the pit...

Best for a swift recovery.