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[PogonaLady]

Just a quick note that I have had experience with...
The Mercury Vapour Bulbs are only effective when they are on..They do provide excellent heat and UV...
BUT
In Summer when the heat is always high the bulbs don;t turn on and therfore your UV doesn't as well...
Just what I have experienced...
If you made the large enclosure you could have 2 platforms that you could make into the basking areas...
Pond size I think half of the enscloure would be plenty..
W-Dragons only need to be able to submerge their body...so you wouldn;t need it too too deep...
I would say maybe 20-40cms deep would be sufficient...
Hope this helps...
On our site here if you go into the forum section and type in enclosure into the search section you should get heaps of pics of enclosures to help you decide...
Chow