For those who are not pretty seriously fit mountain walkers this is an impossibility. Only the properly prepared should attempt any of these. I am surprised this is being proposed in the winter/spring season, partly because the weather will be extreme and also not much preparation for those willing to train up for this.
A couple of years ago a (much younger, hyper-fit) friend decided she wanted all her girlfriends to join her on a mass ascent of Ben Nevis to celebrate her 40th birthday. A dozen of us went, 10 of whom were (and are) frequent marathoners etc, plus myself and another who take no formal exercise and did no preparation. We 2 unfit types said we would start the walk and bail out when we had had enough, but in the end we did both manage the whole thing. My fit friends did the whole thing in about 6 hours, it took me and my unfit pal about 9 hours. It so happened that there was a mass charity walk that day too, so the mountain was very busy. Even so, two people (not from our group) had to be airlifted off with a heart attack and a broken leg, and they hadnt got past the lower half of the route. Mountain runners were doing the whole round trip in 90 minutes!!!
You can see a few pics of our walk at
http://www.flickr.com/photos/8946321@N07/sets/72157606919930996/Note the pics of us lightly dressed at the bottom on a nice flat made up path and the contrast with the victorious pose at the top in a
blizzard. Now understand how serious the weather can be on Britain's highest mountain, when I say that picture was taken in mid-
JUNE!!This is seriously not for the unprepared and nor would it be easy in victorian costume. I think Lady Elsie has the right idea: a nice camp with tea.