Some helpful advice from a (former) cabinet/furniture maker who has surgically repaired lots of abused drums.

1st. Do not use Gorilla glue. It foams up when exposed to air/moisture and will make the crack expand. Now...

Get some soft pine blocks... a couple of small pieces of 1x4 would work fine. Using a belt sander and/or planer, shape them to a concave and convex radius that matches the shell (to clamp inside and outside). Get some wood glue (Elmers, Titebond, etc) AND a syringe... and a few quality clamps. Finally... get some heavy plastic wrap or, even better, cut up an old, noncoated drum head.

The process:

Remove the lugs around the repair. Lay the shell on its side (like you would set it up to play it) on a table/workbench with the crack area hanging off the side.

Using the syringe, inject wood glue every where you can get into the crack. Use too much, wipe off excess with a wet rag, repeat.

Once your sure you have it all coated in glue. Wipe one last time, then put the drum head piece over the repair and clamp the blocks inside and out (use a soft rag or cloth under the outside one to prevent scratching. Clamp the shit out of the blocks. Check for, and wipe off any glue that has squeezed out (be especially wary of the bearing edge).

Let sit for 24 hours. Remove clamps, remove mylar, voila. Good a new. Well... almost good as new. You're gonna have a dark stain/mark inside the shell from the glue. Sand it off or leave it alone.