Quick Iguana Cage Question?

Okay, so my iguana is a year and a half and I am just now able to get his big tank built (should be done in a week or two) and I just wanted to make sure that I had every thing perfect before I go out and buy everything. Let me know if I'm off or missing something. I kind of want to get this right the first time.

I plan on using this design (different measurements and wood):

http://www.lizardcages.fws1.com/iguanaworld.htm

The cage will be 6' tall 6' wide and 3' deep.

I'll be using oak, poly glass, and some kind of tile for the bottom of the cage.

A screen for the roof so that I can simply put his heat lamps/UVB (4, two of each) on top.

A hinged door (or maybe sliding I'll have to talk to the guys building the cage).

Now for my questions. I know that iguanas if left to themselves will poop all over their cage and through their food and water around. Is there some kind of gloss that I can use on the wood (for the inside) that will make the wood easy to clean and less likely to swell and also will not become toxic when his lamps get hot? If not, what do you use to keep your iguanas cage clean and wood-bubble free?

Next question; I plan on taking my iguana into the vet next month to see what sex he/she is because I hear that females have issues with egg laying and he/she has been acting strange lately. He doesn't eat nearly as much as he did when he was only 2ft (nose to tail). Otherwise his eating habits he seems active, strong, angry and green (has yet to stop shedding also). Could the feeding be an issue or am I just worrying too much?

P.S. Because I know this will come up. The only reason I waited so long (not willingly) to get started on his new cage is simply because of financial problems. I almost thought that I would have to get rid of him. But I got a raise earlier this year and was able to save. So, now I have the money and after this he shouldn't cost me too much more. (though I have a savings for any emergency with me, family, and my animals)

And . . . yeah, that's it. I would like to get started this weekend so let me know! Also I'll be getting all supplies from Home Depot and Lowe's. Because they are close to me and I have a Home Depot gift card. So if you can make references to either of those stores for supplies that would be extra helpful.

Thanks in advance!