spidertrag said:
How well will it mesh with Urban Arcana (SRD) & Grim Tales?
I have Grim Tales, so I can try to take a stab at this.
In my opinion, shouldn't have hardly any difficulty, but there are issues. Grim Tales uses the Wealth mechanic out of D20 Modern, and D20 PA ditches the Wealth mechanic for a Barter/Parts sytem. Easy to swap this into Grim Tales.
Grim Tales takes the vehicle rules out of Spycraft instead of D20 Modern, and D20 PA builds upon the D20 Modern vehicle rules (obviously) with the new additional vehicle rules. I don't think it should be much of a challenge to make the two fit to your satisfaction.
Grim Tales introduces rules for Mutations in the
Slavelords of Cydonia epic campaign adventure. As you might imagine because Grim Tales uses the work by Upper_Krust on an "improved" CR system, the mutations in D20 Future(Modern) (and by extension the new ones in D20 PA) will cause you some trouble to determine just what +CR adjustment each D20 Future mutation should have in the Grim Tales system. Probably the greatest difficulty right here is determing the mutation's +CR values. Maybe Upper_Krust's project could take up the cause of D20 Future mutations's +Cr values in his next version update? Then again if the mutation rules aren't in the MSRD, maybe he won't want to touch them... *shrug*
Because Grim Tales doesn't use Advanced or Prestige classes (you have advanced talents instead) the four new classes in D20 PA will need to be deconstructed so that whatever special abilities they have can be made into new feats or advanced talents for Grim Tales rules.
All said, it really doesn't look to me to be a steep curve at all.