Compared to the last hack, this one is not for the faint hearted. I used a cut-off wheel in my Dremel to round the track corners on the observatory end of the layout, and to cut a standard piece of 4-7/8" straight track in half to square off the layout end on Carling Avenue. Sanding sticks were used to cleanup the cuts. I think the round corners are going to need a little underneath support to keep the track flat once it's laid on the sheet foam base.
One other thing: the layout's dimensions are now pretty close to 100 cm long by 50 cm wide, which seems a good size for this thing.
And one last thing: it should be clear that any and all warranties are now well and truly voided :-)