Sorry to hear about illness of the 'oldies', hope things improve!
I've got plenty of ideas for when I do mine. But still don't know about bracing the boards or not. conflicting info on this, some say its essential, other people disagree, claiming their boards aren't braced and they have never had any warping.
Anyway I want get to start them until later in the year whatever I decide. I'm having my garage turned into a games room in a couple of months, and don't see the point in starting any boards until the rooms done.....planning the boards ahead is another matter, looking for info well in advance.
Good luck with them when you do make a start, and please share!