Does anybody know of an after-market manufacturer that would make one-piece bottom metal for this rifle?

Welcome to the forums. Sorry, no

Thanks.

Are you saying that you don't think there's anyone out there making this part?

Welcome, For people to make an aftermarket part there has to be a need or want for the part. You can contact brownells and see if they have some factory parts. but unless you are going to have one custom built you are out of luck

Thanks, I understand that there needs to be a market for someone to make the part. The way the trigger guard screws in (one screw into the receiver, another screw into the plastic stock) just didn't seem ideal to me so I thought there might be a demand. I checked Brownell's and Midway before posting the question, just looking for other ideas.

I've heard Moyer is planning to make some (he already makes steel fully adjustable triggers for A-Bolts as well as bottom metal for Rugers). Hopefully he will soon for those who want it.

Thanks, Jon. I'm not familiar with Moyer, how would I keep tabs on this, what's the name of his company?

Here you go:

http://www.moyersgunrepair.com/

I have his trigger and like it very much.