If it was me, I'd go for or something similar to the Australian HT snipers, repro mounts are available and you have the option of two scope ring size's too, scope wise I 'd use a German ZF39, plenty of post war variations of these (I've a 6 x one which will be mounted to something in the future)
I can't remember what needs to be done to fit a German Short side rail mount or long side rail mount, but think it can be done with some tweaking. (maybe a lot of tweaking the more I think about it)
Im actually kind of curious now, what mounts would be used for this? The HTs are something I havent read much in to. I may want to add this to my project list.