They are EXTREMELY collectible -especially when they are in good condition and especially especially when the bass drum heads are intact (because they are expensive to replace and have to be custom ordered).
I can tell you that the bass drum is usually seen in a "Speedfire" model configuration with a string of single-headed toms in "reverse" order. But yours is a different configuration. The bass drum is shaped that way to facilitate a dual tone effect -depending on which side of that center bottom lug you mount your pedal. It's either a small bass drum or it's a large bass drum!
I think the finish is called "Blue Croco" and it is extremely fragile and tears easily. I believe the lugs are plastic as well -or parts of them are. So, you have to be more careful with them and I wouldn't recommend torquing down on the lugs to try and get the tension high for that reason.
As far as value? I don't know. Hopefully a Trixon collector will see this and chime in with more information.
Cool drums! Thanks for sharing!