Trek 24 Kids Mountain Bike (Full Shimano XT)

Finally found a 27.5 that fits my son, so its time to sell his current 24" Trek. This isn't the typical off the showroom floor 24" Trek. Everything has been upgraded, a complete 2x9spd XT drivetrain with custom laced wheelset with 9spd XT hubs. The cranks have been custom modified to 152mm arms with unior steel thread inserts. Shimano derailleurs offer 2 spring tension settings, the default setting is the lighter spring action, but due to the shorter chain stays on a 24 the higher spring tension reduces chain drop. Read move about it on Park Tools website. This bike is meant to be ridden and ridden hard. There a very few options for real ripper at this size.

He's is currently 4'8" and at the upper limit of fitting this bike.

My son rides Luge, Whittening, Meadows @Aliso Wood, El Moro, Brown Mountain, El Prieto, Westridge @Snow Summit and Mammoth. The bike has survived them all.

Spec:
Rear Derailleur: XT Shadow
Front Derailleur: XT
Front/Rear Hubs: XT
Shifters: XT 9spd
Crankset: XT Hollowtech 22/38 (Custom Modified 152mm)
Cassette: XT 12-36
Headset: Cane Creek Sealed Bearings
Fork: RST Corsa (50mm travel) aluminum steer tube
Stem: Bontrager Race Lite
Handlebars: Bontrager Riser, 31.8mm, 15mm rise
Brake Lever: Avid 7

The bike has been ridden regularly so there are a few paint stretches. The downtube has a more serve scratch, see picture. Nothing effecting the integrity of the frame. I'm asking $450, or make a reasonable offer for a good home for a future ripper.