Safe to repot Cattleya bowringiana now?

[smweaver]

I just received a present from a friend whose grandmother is downsizing her orchid collection due to her advancing age. It's a large Cattleya bowringiana that has approximately twenty mature pseudobulbs and it's the bulkiest Cattleya I've ever seen. Having no firsthand familiarity with this species, I'm hoping that someone here can advise me on whether or not it would be okay to repot the plant now. I believe it's in a rest period since there are no new signs of growth, and I really think it should be repotted because it's overgrown in a large plastic tub (the rather flimsy kind that are used at places like Lowe's for holding perennials, which aren't really designed for permanent use). The leaves and pseudobulbs look very healthy, but I would imagine, just from my cursory examination, that its roots are probably not in the best shape. Would it be okay to transplant it now--as gently as possible--into a new pot with new mix while it's dormant, or is this (as with many of the bifoliate cattleyas) a species that would not react favorably to being repotted while it's dormant? I would appreciate any advice that I can get.

Steve