I would start by finding the place in the room where the drums sound best. Try walking around with a snare drum, hit it, and identify where the snare/room sounds the best. Set up the kit there.
If you are mixing/recording in the same space, I'm assuming you won't be using monitor speakers at the same time as drums are being recorded (so you'll monitor via headphones). You may consider setting up the control desk so that you have line of sight to the drummer.
Acoustic treatment for the control area will be somewhat tricky to get perfect. If money was no object, it would obviously be better to create two rooms, one for tracking and one for mixing....
Anyway I'd suggest focusing on getting drums sounding good acoustically within the room first, and get adequate monitoring on headphones. That will allow you to capture good sounding drum first, something you can't really 'fix in the mix' - unless you replace the kit with samples (yuck...)
You'd have to make more compromises with your mixing space, but you can probably adapt this more and 'learn' it. Worst comes to worst, you could mix somewhere else. I think few project studios have good sounding live rooms but many are well set up for mixing. You can't however do much with badly recorded drums.