Designs based on chassis SdKfz 138 Marder III carried German 75 mm gun in open-top superstructure
SdKfz 139 Marder III carried Soviet 76.2 mm gun in open-top superstructure
SdKfz 138/1 Grille carried German 150 mm infantry gun; also munition variant which carried ammunition
SdKfz 140 Flakpanzer 38(t) carried a 20 mm anti-aircraft gun
SdKfz 140/1Aufklärungspanzer 38(t) mit 2 cm KwK 38 reconnaissance tank with 20 mm turret from a SdKfz.222 armoured car (70 built)
SdKfz 140/1Aufklärungspanzer 38(t) mit 7.5 cm KwK37 L/24 75 mm gun mounted in a modified superstructure (only two built)
Jagdpanzer 38(t) (unofficially known as the Hetzer) a tank destroyer carrying a 75 mm L/48 anti-tank gun G-13 Swiss designation for postwar-built Jagdpanzer 38(t) sold by Czechoslovakia
Nahkampfkanone 1 Swiss built tank destroyer, similar to Marder III, only one built.[5]
Pansarbandvagn 301, 220 Stridsvagn m/41 (SI and SII) rebuilt to armoured personnel carriers.
Stormartillerivagn m/43, assault gun based on the m/41 SII chassis. 36 produced.
Honestly? I had to point that out?
I guess you want me to just call it the Hetzer or something. Still on a 38(t) chassis, although altered.
Plus it could lead to these:
PzKpfw 38(t) Ausf. A-D
PzKpfw 38(t) Ausf. E-G Pz 38(t)
PzKpfw 38(t) Ausf. S