Might want to look at a fabricator. The GW tops were maybe still cored with balsa so if they get wet, they are junk. They also tend to be tough to find and if you do, it will take work to get it back into shape.
Check your lines before buying. I had metal ones with fittings at the end where the plastic ones connected. I'm almost certain the size for my Marlin were 7' and 4'. Stock size was 8' and 6'. They either made em up or cut stock ones down for a OEM fit.
Measure them up. Usually they only go to the rigging tubes and are metal from there to the wheel. Mine were 7' and 4' as I recall. I changed them both and they offered custom lengths at no additional cost. I'll dig up a thread.
Could try something like Alien Tape on the windshield snaps. Only going by the commercials... Not sure if that stuff works that well with small pieces though.
Just seeing this again...
I ended up getting custom lengths that matched my originals and replaced both hoses back then. I think the fittings are fine for mods and end replacements. Good idea to have a set in your work bag onboard to fix a hose if needed. You'll need hydraulic fluid and to...
Sounds like you understand how they go together (like a sandwich usually fastened together from the inside). Sounds like you have a good plan, the hardest part is the execution (getting the screws out, frames separated and prepped to go back in.
There is a round disc that is an XM antenna connected to the stereo. There is a FM antenna as well under the cabin headliner.
Any other antennas are for tv, vhf, fm booster etc put in by owners.