Looks great, you built it up quick!

I'm not totally sure, it also depends a bit on the spring, a 300 lb spring weighs less than a 450 lb. I have the bike stripped now except for the crank so I could maybe try to weigh it,

not a crack, just dirt. I have now cleaned and stripped the frame and it is immaculate.

I think you are right, I think they are always set up with reducers

size?

It's a 1.5 but I'm almost positive that you can also run a 1 1/8" with a headset reducer. In fact, I'm pretty sure my Fox 40s are set up that way.

you can set the frame up as a 7.5" rear travel. You could probably run a 6" fork but it would make the headtube angle not as slack, more of a FR rig than a DH rig when set up that way.

83MM BB, 150MM rear hub. Hope that helps. Thanks, Ryan