Hi Mike!
I checked out the cage you built - awesome job! Nice and big! Chams really do appreciate the extra length.
Personally, though, I wouldn't house two adult females in the same cage - especially veileds. I know some people do it - and it seems to work - but does it really? Some very experienced keepers can and do keep multiple chams together succesfully - but these are in greenhouse sized enclosures. You need to be VERY sensitive to signs of stress and I feel to able to do that you need years of experience.
Female veileds tend to have shorter life spans due to reproductive stresses (ie. large clutch sizes). Even if you restrict food intake (religiously) and can delay or at least reduce egg production - the egg-laying process is stressful. I wouldn't want to add an avoidable stress on top of that.
I had kept two Nosey Be panther females together for longer than I should have. I thought I was pretty astute at recognizing signs of stress. They were growing, eating, drinking - seemed just fine. When I did separate them - the difference was amazing! Their appetites took off and their activity levels increased. I will never be so presumptious again.
Color changes and agression are obvious forms of stress - but there's alot more to chams than that.
My 2 cents.
Jaylyn