You're making great progress. I was going to suggest mounting a small gel battery under the seat myself, but what you've done looks good!
I live vicariously now, through you guys, as I no longer have a shop, or even a damned garage! Which SUCKS, that was my ideal "man cave", though I despise that term. 20 miles from home, and NO PHONE! Oh well, someday, until then I'll just throw out some, hopefully, good ideas to you guys!
Again great progress!
It looks sweet, plus it'll be FUN as hell!