Thanks, Jason. That could be most useful.
I gave it a try, downloading and opening a .dwg version of one of their faucets. It enters TCad as a highly faceted "TC Surface" object. If the faceting is objectionable, it can be smoothed by converting to a "SMesh" and then applying a low level of smoothing. File size with Level 1 smoothing is a tad smaller than the original .dwg. (Converting the original object to a "Solid" takes forever and does not make it any smoother.)