Well, they do have a tarpaulin stowed inside the car somewhere which they drape over the turret when it rains. The rationale for an open top turret was decreased weight (which in turns yields better performance for the same engine power), better observation (this is a scout car after all) and better ventilation (the twin MGs poured quite a lot of acrid smoke inside the cabin of the earlier variant).
Their writing is an alphabet I devised based on the Glagolitic [link] , Coptic [link] and Georgian [link] writing systems. For ease of use it is mapped as a true type font to a normal 26 letter QWERTY keyboard, but it doesn't keep any of the sign/sound associations of any of the original scripts.
Also, whenever I'll need to write something, I think I'll just use my native Romanian with this script, because I'm not a linguist and it's pretty hard to create a language from scratch that will sound convincing enough.
Another thing - this drawing uses version 2.1 of the alphabet, but in the meantime I refined it a bit more and I'm now at version 3.2 and might do a 4th one shortly, because there are still some signs that don't look exactly "right" in my eyes. When I settle on a final design I might publish the alphabet as an "extra" on my DA page, but that's still in the future.
Spot on! Indeed the round one is my take on the Czech Skoda PA-2 "Zelva" (turtle) although shortened and with the weaponry in a rotating turret while the other one was inspired by the above mentioned vehicles... The funny thing is that "in universe", it's completely plausible that the Marbanian designers saw pictures of those vehicles and then copied the design...
Ah thank you, praise coming from you certainly does a lot to stroke my ego! Also, right now I'm also working on similar drawings of light and heavy tanks from both side of the conflict, so stay tooned, they'll be around shortly!