I think you got most of your questions answered!
Repi-Carpet:
That stuff is E-X-P-E-N-S-I-V-E! I only have 2 tanks (rest are now in racks to be more economical/save space). Both tanks have Repti-Carpet. It is so easy to clean - just spot clean until it needs a wash. I spot clean by poop-scooping with a hermit crab poop-scoop which is like a mini-litterbox scoop. Its tiny and fits into all the corners.
Each Repti-carpet pack comes with 2 pieces...To clean, I use "Wipe Out", which is my all-time favorite cleaner for everything. It comes in 3 different forms. I scrub it into the carpet and make sure its really getting into the material and killing off anything nasty. After a few minutes, I use very hot water to further clean the carpet and sanitize it. Don't scrub with anything too hard because you'll rip the fibers and make the surface rough (I use my hands, to be honest). Hang the wet carpet out to dry somewhere in your bathroom or outside. Use the 2nd clean piece for the tank. When this 2nd piece needs washing, put the now-dry 1st piece in the tank. This way, there is always a clean back-up carpet.
Alternatively, you can put a paper towel piece or paper piece in his toilet corner and just replace that everyday.
Here's a link to show what Wipe Out looks like:
www.zoomed.com/html/wipe_out_1_new.php

The Lighting/Heating:
Use a thermostat and one of those timers that you plug into outlets to regulate on/off times. If you have a temp. gun and know when it gets hot/cold, you can just use a few timers to regulate the lighting/heat.
Leos don't need a daytime light as long as there is a window somewhere in the room to provide natural light cycles. (Just make sure he's not under/near the window!!).
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Too many Leos
1.0 feline "Spot"
0.1 canine "Tika"