Okey-dokey... update:
Carried the mast over to the water and submerged it... no bubbles! I'm very happy to report a non-leaking mast. Except for a tiny bit around the mast base but (a) in a capsize that'll be out of the water anyway, (b) any water that gets in it will easily drain out again, and (c) it's moment-arm is very close to the hull anyway since the lower mast plug is in good shape.
Just when I was going to put the boat back in the water and practice flipping it, a storm came along! The wind went from ~5 to ~15mph and I really wanted to go out there... except for the lightning. Fortunately the storm passed after about 25 minutes.
I attempted to recruit somebody to go out on the boat with me, but I was unsuccessful, so I went out alone. Have I mentioned what a PITA it is to raise the sails *after* launching? Wish there was a beach here. 8p
**once out on the lake it occurred to me that I should've had one of the marina folks take some pictures of me with my camera, but by then it was too late.**
After 25 minutes on the water I had the sails up and proceeded to reach back and forth across the lake, flying a hull 85% of the time.

I'm getting better at that!

Occasionally I'd get it up to 45-60° and then chicken out of the intentional capsize... but finally I went for it. Swam around and stood on the bow but for some reason the boat didn't pivot into the wind.
Suggestions?Finally I swam it around and then hung out on the righting line. I could get the mast all the way out of the water, but I guess I just barely don't weigh enough to right the boat alone... hafta buy a righting bag I suppose.
A speedboat came along and a fella jumped off to help me right it... except that at first he climbed on the hull *at the transom* and the boat started to flip over backwards, so I told him to get off and "come stand up here by me." LOL Boy with his weight on the line the boat came up really fast! I was going to tell him about grabbing the dolphin striker but the boat came up so fast I didn't get a chance. He yelped and dove away when he saw the hull coming down at him. LOLOL His friends in their boat laughed at him.

Anwyay, I climbed back on and sailed around a bit more before heading in.
I dropped the main while still on the lake and sailed into the marina on the jib; hauled the boat up on its boards and after *very loosely* rolling the sails covered everything up with the tarp and left for the afternoon.
FUN FUN FUN!!!
In other news, I still drained water out of the hulls even after putting fresh silicone around the pilons. What else can I do?
Thanks for reading, guys!