Haven't had a close look at your diagrams since my netbooks crappy and cutting half of the pics off but, on the tortoise front.. You could theoretically keep a tropical species of tort in the same enclosure as a cham providing that the conditions of the origin of each species matches pretty close.
Thats not all though. Behaviour needs to be taken into account. Whilst a ground dwelling tort isn't going to stress an arboreal cham or vice versa, torts will generally stress themselves out if they can SEE out of enclosures. This includes repeatedly banging against the sides in an effort to get out. THIS is what could stress a cham out.
Natural behaviour wise the tort needs to be able to dig so the substrate will need to be taken into account. Also UV lighting will need to be positioned much lower down to reach the tort. Tortoises also need excellent ventilation. Hope this helps a bit.