Man that seems like a lot of weight on top of that bass shell - yes? Maybe offer $1200 cash and see where it goes from there. Assuming of course you are interested. Consignment or does the shop own them?
I just got a set nearby in well worn shape. Sizes are 22, 18 x 18 and two 10 x 14. Mine is early build with the Camco tom holder , spurs and tom mounts. I think that price is very high. They are certainly cool, but I suspect they may be hard to sell in the future and they are very heavy. The only one I have cleaned and put back together is one of the 14 toms. I really don't think it sounds as good, as I expected or hoped. I am geographically close to Lenexa Kansas where they were built. The first time I actually saw a set of Zickos was around 1970 or 71 at a teen dance in a small town. And yes, I will be afraid to mount both toms on top of that bass drum. Exercise caution. Parts are hard to find also.
I interviewed Bill Zickos years ago for a Not So Modern Drummer article. He explained his proprietary method of building acrylic drum shells. Far superior to Vistalite and others. His shells were rock solid. Thicker than Vistalites, with a bearing edge that was rounded over to the outside.
I had a Zickos snare for a while, and I really liked the sound. Really good snare response and tons of attack. Like halfway between wood and metal.