Not so much an aftermarket item but the Dragon 1/72nd scale M65
Atomic Annie that forms a diorama partner with the Haunebu to give a
sense of scale.
The Haunebu would have ben consigned to the ultra-secret scrap heap
around the same time as the Atomic Cannon so they make an
appropriate duo for the diorama.
We could imagine that the Atomic Annie platform may once have ben
adopted to ferry the Haunebu around the desert prior to it finding
its final resting place in the sand.
The Dragon kit would not normally be something that would interest