The Wilderness 30 was not really conceived as any kind of liveaboard and is pretty spartan.... and narrow, as SD pointed out. A J30 would be luxurious in comparison.
It was considered a pretty lightweight boat when it was introduced, and is a quick, responsive boat that will reward good handling. But roomy and comfy maybe not.....
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)