You can certainly use a VS top with CMC bows.
I have CMC metal "high-bows" but bought a "low-bow" Haartz top from VS. I put it all together with the rear snaps installed and then temp-fitted the bows to the side latches to get the height right. From my top installation instructions in the knowledge section:
"I got the height of the bows “right” by holding them in place with vice grips, then standing off to the side and looking at the line the top made. When I was satisfied with the look, I scribed them, drilled new holes and cut off the excess on the bottom. "
I think I cut about 2" off of the bottom of each bow. YMMV so set it up where you like it. You can even leave the original length as it won't interfere with anything going up or down.
I used the CMC windshield header but as Greg mentioned, I had to remove some material to get it to fit the curve of the windshield properly. I just used a Dremel tool with a rasp bit and had at it, messing with it til it fit. It's not changed shape since 2004.
Everything you ever wanted to know about installing a convertible top from scratch (and a whole lot more info) is up under "Resources/Knowledge Base" at the top of this page but you need to be a donating member to see it.. If you PM me I can send you a copy of the top installation stuff that Alan Merklin and I wrote years ago.