One of our male dragons is in a huge plywood enclosure (there's room for two dragons easy but it's not breeding season yet
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). ONE dragon should have about 50g, this doesn't mean they each need 50g worth of space, but this should give you an idea. It's more important to have a long enclosure than a high one but dragons do like to climb a bit. For 3 dragons I'd say at LEAST 100g of mostly floor...and remember, you have to be able to separate the male. He shouldn't be in there all year.
As long as the enclosure holds heat well enough than it's fine. Dragons need basking temps of about 100 F, they can go a bit higher even. Cooler temps of round 85.
Careful - you don't want your dragons breeding too much, you must to be able to seperate the male. Dragons lay clutches of about 30 eggs, and they can lay more than one clutch in a season, sometimes 3 or 4, usually about every 3 weeks, and they can retain sperm and get pregnant again several times from being bred once! With two females you could easily be looking at 120 eggs EACH!!! That's 240 baby dragons, all of which eat a ridiculous amount! Eggbinding is also an issue which can lead to death if females are allowed to continuously breed.
You must make sure your dragons are at least 18 months and healthy before being bred.
You must also ensure you have a good lay box or lay area to reduce the risk of eggbinding because of the female looking for an appropriate lay spot.
Be prepared! Not trying to discourage you, just letting you know!
Hope that helps!