well, here's how I would do it...
start with a dowel, the bat looks to measure 32-36 inches depending on the panel. It tapers. So, I used a poster tube and cut it to a cone the Duct tape.
Then I used 4 inch pvc pipe for the mold.
the cap will help center the bat with the mold
try to keep centered.
then i will glue this star to a 7/8" diameter lexan tube. the star is 3" at longest to keep the lexan tube centered in the bat
Moldstar 30 for the mold
pour no keep the tube centered.I will install lights later. LEDs or EL wire.
and then...
lotsa whiskers on the bat, I am gonna wet sand.
But, that's how I would do it. Lights when I decide what to use, but the 5/8" inner diameter tube fits AA batteries
EDIT - OOOOPS!! this is the star I made out of LEXAN. I glued it to the end of the lexan tube so that resin wouldn't sneak up the center tube, also, the points of the star will touch the sides of the mold, keeping the lexan tube centered.