It isn't ideal to have the two halves of the boat cored with different materials. However, it isn't a complete deal breaker IMHO. However, doing the work from the underside is going to take a lot longer and it is a lot harder to get it right. If you brace the layers properly, you can probably do a decent job of it. Using vacuum bagging would help, but that may be more complex than you want to get into.
One person I know who did this on two different boats said that doing it from the underside took about four-to-five times as long and that isn't counting the clean up, which was a lot more laborious as well. The repairs were about the same size IIRC.
If you do decide to do this, I would highly recommend using epoxy from Progressive Epo_xy Polymers and Resins
in NH and getting your fiberglass from www.fiberglasssite.com
. Remove everything from the cabin that you can and tape a heavy plastic tarp over the interior.
I also recommend using a full-face respirator mask with vapor and particulate filters rather than goggles and a half mask. DO NOT USE THE DISPOSABLE MASKS—they are worthless.
The full-face mask respirator will last a long time if you care for it properly and is far more comfortable than the half-mask and goggles.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.