Difficult to estimate a value -outside of the cost of the parts. Since a lot of what collecting is, has to do with the name and history attached to the drum or to the company.
Custom built kits like this are quite common these days and there really isn't much to them as far as original design elements. They all are basically built from the core of raw materials that are available...in essence, Keller shells, Gibralter mounts, knockoff lugs and generic hoops and rims. It is likely that this kit wasn't even built by a custom builder due to the lack of an identifying badge. Probably something put together by a hobbyist.
Resale value is low on these kits. MAYBE a couple hundred to five hundred dollars for the shellpack if they are in excellent shape and someone needs it. That's MY guess.
If it were a Camco kit, it would be worth several thousand dollars.