take a very close look at Heisenberg's "virus house" reactor.. it was the bomb. Fill the void spaces between the rings of uranium with heavy water to breed enough plutonium etc to sustain a chain.. drain and replace with kerosene to inhibit neutron flow... total weight of the whole thing is under the delivery limit of a dive bomber.. all the rings are attached to the oddly shaped device with breakaway attachments: The impact of the device against a hard object breaks them free and allows the critical mass to smash together.
It wasn't a good design I grant you, but it was a workable one.
Ah no, not even the slightest bit close.
There was no HEU which is essential for fast reactions
Had this been HEU, it wouldn’t achieve anywhere near the critical assembly rate of around 1500m/s for 85% U235. .
Reactor breeding Pu, occurs at parts per million over a period of days typically 20-30 days for optimal PU239 and still less than 0.01 %.
Germany could not have atomic weapon in any reasonable timescale and didn’t have access to materials particularly Nickel, necessary to support the project.