I am also planing to mount the coil underdash utilizing a bulkhead connecter through firewall.
Will also constuct a flip down panel hinged at the rear underdash to mount the MSD,fuse panel and associated relays. Out of sight, out of the way.
Trunk mouted battery as well.
I too have removed all enviroment elements so there is plenty of room.
Still have to figure out some sort of defroster though. But thats for another day.