Shoot! I am definitely impressed by the response this “off-the-beaten-track”- vehicle aroused. Looks like this is really THE place to post my questions. Thanks a lot to everyone. This really helped a lot and your informations and suggestions are all very much appreciated.
@ Henri-Pierre: I was surprised by the name “Kilshon” you mentioned because the Museum called this vehicle “Chachlilit”. Under the links you kindly provided and when extending my search with the name ”Kilshon” I finally found some information in the www. Same if you spell “Chachlilit” “Kachlilit”. Thanks for that.

@ Tom: Thanks for the additional information as which “hatch” version this Sherman belongs too. To this moment I did not even know to look for it. Your kitbashing suggestions are appreciated but if I will build it (and I think I will) I will build it in scale 1:72. Usually this makes things more difficult as there are hardly any kits in this scale in the first place, usually no aftermarket stuff too, let alone any conversion. But this seems to be the exception from the rule as there is a conversion from Miniature Model.

Now I only have to figure out an appropriate base kit with HVSS in this scale. Any suggestions?
@jowady/@Paul: Pauls statement is confirmed by the information provided by the Museum. If not all than at least most israeli Shermans were converted to Diesel engines. Here is another pic of the rear of the second vehicle of the Museum. Here the different Sherman version is visible as well.

@Tom/Kurt: Thanks for your remarks. I would appreciate it very much if you could point out the difference between the israeli style conversion and the US manufactured HVSS-Support as my ignorant eye has not detected it. Your statement is supported by some information I received in the Tank Museum in Latrun where it was said, that quite a few if not all Shermans the Israelis bought with VVSS-supports were converted in Israel itself to HVSS and thus received wider tracks too.
@Scott: Thanks for the hint at this conversion. Even if it is not “my” scale. One should only be aware that AEF Designs on one hand makes very interesting conversions but on the other hand I know of more than one modeller who sat crying bitter tears in front of his kit when realising the quality of the cast. Quality seems to be very variable and it is probably not the worst idea to see and check with your own eyes which kind of quality “your” kit is.
Happy modelling
Michael