Have you looked into the $$$ of the plexi you want to use. A couple 6x3 (lxh) and 3x3 (wxh) at 1/2 will run more than just a couple hundred dollars.
Heres a good link with representative prices.
http://www.selectproducts.com/product/plexi.html. Other than that, You will also need a very good ventilation. An enclosed closet will get super humid VERY quickly and ruin drywall etc. My 8x4 cage with a 50 gallon pond makes my entire bedroom very humid, esp in the summer.
I will also have to say that 18" between tank and wall will NOT be enough. When you go to pull a 4 foot caiman out, it will be VERY tight, esp when it starts thrashing its tail. And if it is aggro, you'll have VERY little space to get out of the way of a hard tail smack or a nasty bite. Good idea for a tank but i'd look into something else.
>>I think the space to access the cage will be OK. The plexiglass panels will slide straight up out of the tracks so there can be nothing seperating the interior of the tank for cleaning. I'm pretty skinny and as long as the caiman does not get to rowdy when I try to take him out it should be enough space. The pond will be drained for cleaning with a hose and out a nearby window.
>>
>>Thanks for the compliment on the drawing. I used Adobe Illustrator to sketch it out. I am a graphic designer and use these programs daily. I needed an idea of what it should look like.
>>
>>I plan on getting a juvenile dwarf caiman and let her grow into the enclosure so it will feel like her home instead of switching her from enclosure to enclosure. The ability to close the door and "seal off" her enclosure should give her the privacy she needs and keep the stress to a minimum. I don't want to get one if I am not going to be able to provide a good, happy environment for her. I gave up my spectacled caimans to a reptile collector with ample space so that they would be happier.
Plexi prices