MTH engine shed center lines

Using RealTrax O-72 switch and placing the engine house about 18 inches further down the track.

You would be better off with a Wye centered between the doors, or using a #4. A Ross #4 (or #5) can do as little as 3.5" center to center, so 5" will be a cakewalk. With flextrack, an 11 degree Wye would work, but you're likely to need a very long lead track into the shed.

Using sections of Gargraves Flex [off Ross 4-way] bent just sliightly to achieve the 5" O.C.

Somebody at MTh certainly didn't do their homework it seems, especially when the product descriptor states O-72 switch.  Would have been easy for draftsman or mechanical engineer to grab some various manufacturer track types and O-72 turnouts and measure centerline to centerline and get an average.  My RRTrack program showed about 5.35 to 5.6" centerlines and given the slight sectional track mechanical give, certainly 5.50" would be attained.  Unless this was not an MTH designed product but MTH using someone elses moldings with MTH stamped on them.

Oh well, guess my money will be going for something else.