Glad to help in any way I can. Here is some information...
Sails: If you need sails, you can find used sails at reasonable prices at various sources on the web such as eBay, Minney's Yacht Surplus -
, Texas Resale Shop
etc. Just look up the rig dimensions at SAILBOAT RIG DIMENSIONS OFFICIAL WEBSITE
and compare the dimensions of the used sail (or its boat) with the 10Ms. What sails would you be looking for?
Roller Furling (RF): I did not have to install/change the RF. My Sea Fever came with the stock 'Stearns Dynafurl' roller furling that is working fine even today! I just changed the delrin bearing inserts for the swivel and that was it. Jim Stearns made some good roller furlings in his day. I have known of people changing the RF on their 10Ms with ProFurl, Harken etc.
Batteries: I have had 2 Group 27 batteries in my 10M. One was installed in the STA locker and another on STA side of the Atomic 4 inside the engine compartment. When I re-powered to a diesel last year, I removed the battery from the engine compartment and moved it to the STA locker beside the other battery. I made a box and glassed it in. I will see if I can find some pictures of before/after of the battery re-location and attach them here. Making the new box took some creativity and measurement but was not a big deal. Some measuring and 'forming' with cardboard template and then on the cutting marine ply and glassing.
Floor: Fix the leak from the mast pronto! Suggest take a look at Spartite
They have some great products. You will need to measure the cross-section of the mast and send it to them or send them the type of spar - you can get information from Dan's website at Pearson 10M Info
refer to the Mast section.
I don't have a teak floor in the saloon but a FG floor with custom carpet on it. IF you have a teak and holly floor, I guess careful sanding and varnish is the way to go. Remember the teak and holly veneer is very thin! Let the floor dry properly (after you fix the mast boot) and then tackle it.
Hope this helps.