Very nice enclosures TrueBlue, in pic 2 it looks like the dividers don't go all the way to the back, is this just a vagary of angle or is there really 6 enclosures and the project was not finished at this point, I would have no problems putting my Nakies in enclosures like that. As far as the ventilation subject is concerned i don't think Blue had the type of ventilation you are using in mind when he said exessive ventilation, what you are using is passive ventilation so there is not a continueous exchange of air, what i think (and i do not mind being contradicted) Blue meant was having too large a vent on 1 end and too large a vent up high on the other end which does cause exessive air flow and air exchange (active ventilation) in theory this is a good ventilation system if set up right, otherwise especially in the colder months it can cause exess humidity and condensation in 1 or more zones of the enclosure IE above the lower vent and below the higher vent. This is my theory and opinion and i do not mind being proved wrong, iether way i might try the pegboard on my new Spotty enclosure when i get around to building it as i don't really need ambient heat so much as i need floor heat, it could be adjusted with some thin ply over some of the holes if it got too cold in the enclosure in any case.
.............................................Ron