... get a couple of threaded brass inserts from the hardware store. These are fixtures for attaching machine screws to wood. The have a coarse thread on the outside surface to drill into the wood and a fine machine screw thread on the inside to accept a bolt.
Drill a couple of holes in the underside of the hull. I use a drill press to ensure holes which are centered and vertical. The hole should be a bit larger than the outer dimension of the threaded insert. Do not attempt to drive the threaded insert into the resin. Resin is brittle and will break in unexpected ways. Wipe some Vaseline/lubricant on the end of the bolts and epoxy the inerts into the drilled holes. Use the protruding bolts as handles to adjust the alignment and ensure that they are sqaure to the hull bottom.
When dry, fill and sand around the inserts with your favorite putty. The bolts are removable (since you used the vaseline) andallow the model to be attached to a temporary building board. Complete the model as normal.
I use brass lampshade finials as brass pedestals. Again using the drill press drill a through hole up from the bottom a bit larger than your bolt. Cut off the top knot. Polish and seal with a coat of Krylon clear to prevent tarnishing.
Stain and finish your wooden base. Drill a couple of holes as wide apart as your holes on the bottom of the hull. Countersink the holes on the underside of the base. Insert the bolts up through the base and pedestal and into the threaded inserts in the bottom of the hull.
I have tried other methods, including soldering brass rod to the tops of a finial and drilling appropriately sized holes in the bottom of the hull. It will work but the fixture is a bit more fragile and may need to be cemented for a secure fit. That means that that the idea of using a temprary base as a building board is out.
I have also drilled the holes in the bottom of the hull and tapped a thread into them. This has worked well, but care must be taken to avoid overtightening the bolt. The resin threads strip easily.
Generally attaching a round (hull) to a flat (pedestal) has little surface area for secure attachment. Some mechanical attachment means is preferable.
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