I have seen also that SKB61, unfortunately in no longer available, also, the Guardian case (Gary), is also no longer available, and also if they make it, dont know if they have it for the T5 61 size....I
I like the idea to have it reinforced with Plywood.
And yes, I own a Rock and Roller cart, the R14, is a life saver, instead of lifting or hauling all the gear yourself, just pull or push.