Here's my plastic SdKfz 139 Marder III . Same hull / track sprue from the 38(t) with another full sprue of upper hull , gun and crew . The 38(t) second sprue was about the size of a Rubicon tank crew figure set , but costs the same $ , wtf ? If they're smart I'm sure the BA guys could wring few more SPG type vehicles out of this hull......
Kit negatives IMO , overscale ribbing on the fenders and molded on tools , the 38(t) , Marder III , and the various other SPGs built on this hull had tools in different places , so one "size" won't fit all .
The gun shield is molded way too thick , as is the case in many kits of this type , not an easy fix by any means . The front crew ( driver / mg ) hatches molded closed and thick . And last but not least , the rear crew seats are molded flat on the rear hull sides , unlike the ones on their 20mm Marder III ( if these are indeed PSC designed kits ) , a lost opportunity IMO