Planar Speaker Asylum: Rebuilding a pair of MG IIs by Old School Audio

A few years ago I happened upon a pair of Maggie MG IIs that were about to be thrown in a dumpster! I could not let that happen, so I took them in until I could decide what to do with them (one had a bad buzz, hence the death sentence). Recently I decided to remove the old wires and glue and rewire the pair.

I bought the rewiring kits over the summer and now I'm in full rewiring mode. I've already taken the right speaker down, removed the wire and most of the old glue from the mylar. I'll put new wires on about Oct. 24. So here are my questions:

1. The speakers were not damaged or abused and the original frames are in really nice condition for 30 years old. The crossovers are original. Should I replace or upgrade the XOs while I have the Maggies torn down? If I go with external XOs, do I rewire the speakers differently?

2. I'm not into planars (these fell into my lap), but it appears most newer ones are biamped and run with a subwoofer as well. Should I keep these old MG IIs as original as possible and enjoy what I have, or can I get much better sound for not much more effort if I convert them over to biamp mode now?

3. I've been an Allison fan since the mid-70s and have a decent pair of Allison Twos that I use with a Carver 772 receiver I bought a few years ago, and I enjoy the sound. I don't have plans to change my system at this time (recession and spouse being two good reasons), so I was planning to test the rewired Maggies with the Carver. Will the Maggies sound decent through the Carver, or will I lose a lot using the Carver to drive the Maggies?

4. Any other advice or comments on my project, such as rewiring tips, etc.? What about "burn-in" time, what is that all about?

Thanks to all for reading and your comments.