Well, the thread seems to move slowly, but.....
In the time since the last post, Perfect Scale Modellbau has released a conversion set that swaps the sqare engine cover for a rounded one, and adds canvas for cab and carrier.
Also, they have added an electronics shelter module for the carrier.
And, Tamiya has released the Ambulance version of the goat which adds covers to fore and aft, and maybe even the windshield braces that were overlooked among other items in the original M561 release.
Patience has virtues!