I bought mine from Bud's about two months ago. They come with the cheap plastic stock, but if you're right handed, there are many options available for you in a replacement stock. None of the aftermarket stock that I'm aware of will use the factory "bottom plastic" of the Trophy Hunter for the detachable magazine, but they can be easily and cheaply converted to a blind magazine or you can add quality bottom metal to a quality stock for a detachable mag if that's what you want.
There is no "decide if you want centerfeed or stagger feed". All the rifles made in the last 6 years or so, so all the Trophy Hunters, have the centerfeed action screw spacing.
If you're looking for a project gun to tear apart from the get-go, go to a pawn shop and find one with a good action and a beat up stock and marginal barrel. Get it for a good price and go to work.
The Trophy Hunter makes sense if you're looking for a long term project that you can shoot right away and upgrade incrementally as time, funds and parts availability allow. That's where my Trophy Hunter is at this point. The scope, bases and rings have been swapped out. I'm waiting on the stock. Being left handed I only really had one option: Stockade. Spoke with Kevin there a good bit and got my stock on order including his bottom metal and the WSM compatible AI type magazine. Wait on that is looking like mid-March. In the mean time, load development for a couple different loads from long range deer/elk/antelope to medium range target and coyote. I think a 110gn Vmax at somewhere around 3700fps should be interesting.