You can keep the domes although in future you will know they are not really needed. I would tentatively suggest you buy two par 30 or par 38 flood beam halogen bulbs @ around 75w, and in this case have each dome touching the other, then see what surface temp you get. The ceramic heat emitter is only suitable for raising the ambient (air) temps either during the day or at night if the temps get below approx 72f, it is not suitable as a "basking bulb" because they direct the heat all around rather than downwards. The smaller enclosure (and maybe the larger?) will need a barrier (3/4 inch plywood) at the front to hold a decent depth of substrate, it should be easy enough to put something just behind the glass front, fixed in place with metal angle brackets/other.