1M belly pan and hood on zrt?

If you have a '99 or newer T-cat/ZRT, the chassis is the same as the ZR3, and the plastic will interchange. I'm sure with enough dedication, you could put it on the older chassis as well, but it wouldn't be a simple bolt on.

I know a couple outfits (JAWS comes to mind) made pipes to put the 1000 triple motor in the ZR3 plastic.

Here's the opposite of what you're looking for , we put a big triple in a King Cat chassis and couldn't fit the pipes under the hood, so we put T-cat plastic on it...

We never had a T-cat motor in the twin plastic, so I'm not sure if just a taller hood would help. I would be surprised if that's all it took. The ZRT2 style is a couple inches longer in the front, and a bit wider also. Like I said though, there are a couple places that build pipes for that chassis.

The triple in ours is actually made from two 900 twins cut/welded together, so it's a bit bigger than a T-cat/ZRT engine. It probably weighs ~30 lbs or so more than a stock King Cat. We didn't measure it, didn't want to know. But the power more than makes up for it. It feels lighter than our T-cats ever did.