You'll first have to find a Ti Commander frame. They were out of stock and looking for a new supplier the last time I checked. Once you find your frame, you can have your 'smith do the bobtail conversion.
If you're planning to have it built in .45 caliber, I'd suggest a steel feed ramp insert, rather than a ramped barrel. If you're using a smaller caliber, then a ramped barrel would be fine. Kart does make ramped barrels, both in the Clark-Para cut and the Wilson-Nowlin cut. I personally beleive the C-P cut is the better way both for installation issues as well as durability.
When you're all finished, I'd suggest having the frame rails carbide coated by Tripp Research to further enhance durability.
Here's a pic of one that I built for a client a few years ago.

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