I have most of the Bandai's, but really should sell some of them when the collector's market recovers. They are all buildable but clunky. The only ones I have finished are the KW, Schwimm, Maultier and Panther, all of which required a lot of work to add/refine/replace the details (the Panther particularly). As has been pointed out to me I also have a half finished Long Tom (WWII style tires anyone) and a pretty far along Valentine (even replaced the tracks on that one) that I need to complete and share with y'all I even have a Jadgpanzer conversion that I started long ago but have never completed.
Gaston and others have pointed this out before, but most of the Bandais seem to have shape issues, some more than others. The Panther series and the Mk. IV's are too long buy about a foot for example, and the US Half Tracks are too wide by about the same amount. On the other hand they are the only game in town right now for some vehicles. I have the kits and Track48 parts to uprgade one Ferdinand/Elephant and a set Fruil's and a metal barrel for one Jadgtiger (the latter will be a real b***h to chop/stretch and correct) and when I have finished some of those WIP's I will consider taking these projects on. If you are going to take on a Bandai it will have to be a labor of love, that's for sure.
I even have a Jadgpanzer conversion that I started long ago but have never completed.