Oh , those are so cool! This will be a fine project no doubt John, and I'm excited to see the final result. I built the old AMT Hs-129 many years ago. Not long after I did, I entered two tanks models in a contest held in Austin at Camp Mabry. It was also open to any ground-attack aircraft and so I thought, what the heck, I'll enter her for grins too. Well, it's not much of a kit and I didn't expect any prizes for it. I sure didn't have to worry about that because right beside her on the table was a beautiful Hasegawa kit of the same plane, built by the estimable Milton Bell of Austin. His model made mine look pretty darned shabby!
Have you decided on the armament yet? I went with that big, honking 75mm gun in the under-fuselage cupola. I also faired over the lower guns mounted on the forward fuselage. It's one of the few models I've done that hasn't had a true "photo session" at our airport. One o' days, I'll get that done too!
Good luck with your 129! 🙂