Are you planning on running the bilstein 7100 series coilovers or just regular 7100 series?

Call up e-shocks.com
They are extremely helpful when it comes to valving and custom applications like what you're describing.

I'm doing something similar.
Only I went with Fox 2.0 10" travel coilovers up front with IFS. Just waiting for my fabricator to get some free time and we'll work out the rest. I want to maximize the IFS, and eventually lose the torsion bars.
If it doesn't work out well with the IFS, at least I already have the 10" travel coilovers for an easier SAS.
BTW.. The place that I ordered the Fox coilovers from asked about the valving and I described the application and they valved it accordingly.
Bilstein shocks are the same way. Most of the 7100 series shocks can be purchased with specific valving or can be custom ordered.

Good luck with it.