I have a 1977 Brendella Tunnel Pickle and mine is a jet too. Oh and it's not black... I'd attach a photo if I could figure out how.
Brendella pickle, sorry I didnt see your post until now. Id love to see some pics of yours. Heres the "tutorial" on posting pics.
http://www.socaljetboats.com/suggestions-support/picture-posting-instructions/ Most of the time I just use Photobucket though.
I did some work on mine again.
I got the hole cut for the intake. For some reason I was able to get the cleanout cover out past the transom and still have 2" of hull behind the cutout (didnt need to cut through the transom).


There was alot of cracking in the flowcoat on the floors (mainly on the keel). I decided to see how deep it went. grabbed the grinder and went to work, the flowcoat down there was around 1/4" thick or more in places.

I guess they didnt care much about weight. Unfortunately the cracking is down into the glass, not sure how far. But it needs to be taken care of. Lots of grinding and glassing to do in there.


Then I decided to check the sponsons. There are some places where the fuel tanks where rubbing on the floors out there (circled in red). They rubbed almost half way through the hull. Brendella pickle, you better check this on yours. The back brackets on the tanks mounted to the outside wall of the tunnels, letting the tanks move around just enough to do this to the bottom. Its the verry back of the tanks. While I was looking out there I saw a funny looking line on the bottom. Grabbed the grinder again. Found a big azz crack in the glass. didnt go through the flowcoat, and cant see in from underneath. Must be an old repair to the bottom, either way it needs to be be taken care of too.

At this point I have to quote Ralph Brunt from his getting ready for paint thread (words of wisdom !!)
WARNING...if you have a boat in this bad of shape do NOT try to repair it.... take a chain saw to it and get another hull 
But Im still going to fix it.