I'm doing a cab now with a 1/4" roundover. I would like to keep that roundover for asthetic reasons. The only corners I have found that possibly fit a 1/4" radius roundover are the early Ampeg corners available from FlipTops
and also from Vibroworld
(apparently closed at the moment - part number 2801-Xnp). These are listed at 5/16" radius and would probably do well on a 1/4" roundover with Duratex or Tolex covering.
I'm not sure I like the look of these corners but if I can't find any others I may end up liking it just fine. They are also relatively expensive. Are there any others?