pity, but is just one of the things that happens with one man business ventures, unless someone can take over.
Now if there was an online company which could manufacture items like this in the same way 3D printing can be done then , the 3 problems, illness, retirement and holidays would be a thing of the past. I have seen somewhere that they can now use 3D printing to create printed circuit boards, so something like a working model railway/tram bogie might not be impossible.
Narrow gauge Francophile interested in 1m, 60cm,50cm , 40cm and smaller gauges . Build in scales from 1/6th to 1/24th. Also 1/32nd and 1/35th using 16.5mm track to represent 50cm and 60cm gauges. http://www.rue-d-etropal.com