Thanks for the positive comments everyone.
@ Oshyan; it's to have my options open for future jobs that require slight boiling in clouds. I recently bought Ozone for XSI to have internal atmospherics, but I have to say the actual look of the clouds themselves falls very far short of TG2's. However, the boiling in Ozone is very sweet indeed, and I suggest it be looked at by you guys as a kind of 'target'. I'd suggest having it present in your Mt. St. Helens project just for that little 'something extra', but only very subtle. My test is too extreme, but I wanted to see what was going on when the two transforms where mixed.
@ Gastar; as usual render times are high, about 25 minutes per frame at 1024 wide, but the quality is up quite a bit so no surprises at all. The proper frames are much better to look at, but I tried to keep the mpeg conversion low in size for the forum to download.
I anticipate render times being significantly lower (even half is fine) when the optimised version is released.
Considering this is the first attempt I have to say I'm very pleased so far. My main comments (as a client) would be the edges have gone softer compared to a single fractal animation (I'll look into that), and where both transformed fractals don't intersect you can just about spot the Y direction of the transform, up or down. But the overall effect tends to negate that impression, and only the most demanding and critical of clients would demand that be fixed I suspect.
I'll post any more versions I get around to doing.
One important note is you should use Ambient Occlusion, not Final Gathering, to avoid flashing.