On the keel, someone probably snugged the pivot bolt up too much in an effort to stem weeping, on trailer it's a fairly simply process to remove/replace pivot and seals. (possible crud built up in well too)
The rest depends on how much effort you'd want to put in it, I'd grab one if it was local. I like the trailer sailors in that size range.
On pop tops, I have had a couple pop top boats, and found that I seldom if ever popped them. More effort to put up than they were worth in convenience, and nearly every one I've seen only had actual standing area in the slider area anyway, much easier to simply open the
hatch......
Last one, I glassed the top down, and got rid of all the props etc, which made for less head bumps, eliminated leaks, lightened the boat, and stiffened it up noticeably. Interesting development was that the ports stopped developing intermittent leaks, I assume they were from hull flex etc.