I'm relatively new to this hobby, about 5 months in. My first build is a Grubee GT5 in the Greenline Army bike frame. Mods include: chopper fork, clubman handlebars, homemade killswitch toggle, upgraded plug and cap, dual boost bottles (haven't seen much difference, but looks kind of cool), homemade headlight, battery box, and mounting bracket assembly, expansion chamber, chaintugs on modified rear dropouts, new euro bottom bracket with primo hollowbite cranks with diamondback bmx pedals, handlebar stem-turned layback seatpost, front disc and rear caliper brake on dual-pull lever, roller clutch mod (awesome), shortened throttle cable and rear hub coaster brake to freewheel conversion. I've made patterns and have plans for a wooden excelsior-esque gas tank, and aluminum double-braced dropstand. I also may rejet my cns carb once i get it dialed in. I may have missed some things, but hopefully more to come...