I'm starting to look for longer lines, mainly for peace of mind. I found a local place that will make custom length braided steel lines, but they do need the originals first. I'm going to order up some replacement lines from a local auto parts store for the mock-up and to ensure they can find the necessary fittings.
So far, I've found the following details of our brake lines from AutoZone, of all places

Brakeware/Autozone wrote:Part Num:70857
Part: Driver side, rear
Brake Hose Assembly Length (In): 13
End 1 Fitting Material: Treated Steel
End 1 Type/Size of Fitting: Banjo - 10 mm
End 2 Fitting Material: Treated Steel
End 2 Type/Size of Fitting: Junction - (2) 1/2-20