Here's my take on the problem: Materials
Three acrylic toilet plungers cut down to twelve - eighteen inches (12-18").
Six pieces of 3/4 pvc pipe cut to one or one and a quarter inch (1-11/4
") Or whatever matches the diameter of toilet plunger.
Three pieces of masonite for bases. Size and shape will depend on what seems to work best for you. Nine to ten inches in diameter, cut in any shape.Construction: Base Stands
1. Mount three pieces or cut pvs to underneath the model in a triangular pattern. I would drill and mount with screws and resin epoxy.
2. Mount one piece of pvc to a piece of masonite in the same manner.
3. Base stands: mount the three pieces of plunger into the pvc on the bases. Secure with resin epoxy and screws as well.
4. Then you insert each of the completed base stands into the piece of pvc mounted on the Manta model.
The basic idea here is create three different bases that will support the model. You'll want to check the placement of the pvc brackets so as give you maximum support for the model. You could even run a support pieces of wood or plastic from each base to each base to give further support and keep them all in the right position.
It's possible that at whatever hardware store you go to will have "T" shaped metal brackets (or even pvc brackets) that are the right diameter as the toilet plungers. Then you have a ready made bracket that you can mount directly under your model.
The big problem here is getting a stand that will support such a large model adequately and securely. NOTE
A. Spreading out the distance between bases (the triangular pattern) gives the best weight distribution and support to the model. Also reduces the chances of the model tipping over (AVOID AT ALL COSTS! Resin models kind of "explode" on impact!)
B. By keeping the height of each of the base pillars (toilet plunger) you minimize the damage,if does happens to be tip over. The lower to the table, less damage to the model. Higher elevation means greater damage to the model.
Well that's it. I hope something this will do the trick for you. Please post pictures of your progress, especially before you carry it out. This will allow members to give you some feed back. On such an expensive model you want to get all the help you can.
Hope that helps.