My guess is to make single handing easier.
We hear that a lot.
It doesn't, really.
IMHO, it is more important to avoid being a "slave behind the wheel" than it is to relocate the winches further aft so they can be used by someone behind the wheel.
When there is crew, they can't work the winches 'cuz they're too far aft and/or the helmsman is in the way.
I have been singlehanding my boat for 20 years. A reliable autopilot is far superior to relocated winches. I run my boat from in front of the wheel. The only times I'm back there is leaving and returning to the dock, or relaxing in my perch seat.
Yes, I know, some builders have been doing it. Doesn't make it right, especially for boats with single wheels. Double wheels it could work, but you don't have that.
Before you move them, please think about it a lot more. And while you're thinking, learn about how your winches are built to be able to answer your original question. An internet search on your brand of winch should pull up all sorts of information, like maintenance, service, exploded diagrams, how to disassemble, service and rebuild, etc. And if you can't find your Maxwells, start with Lewmar who have great documentation. Most winches are similar, not identical, but close enough in concept.
Good luck and happy thinin'.
