Yikes!
Extreme model kits
German Super Heavy 80cm Railway Gun Dora

Presented at the toy fair. HUGE kit. Shipping in US is free already included in cost due to size. 6ft long, gun is 160cm. Injection molded.
Status: In Stock
Current Inventory: Only 6 Left
Retail Price: $799.95
Your Price:
$719.95

If it doesn’t shoot real shells, that is too much.
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Little Boy Atomic Bomb

This 1/12th scale replica of the Little Boy atomic bomb features accurate fittings and surface details. Kit also comes with small loading trailer perfect for display
Status: In Stock
Current Inventory: Only 3 Left
Retail Price: $69.95
Your Price:
$62.95

That’s a lot more reasonable, especially with the nifty trailer included. Still, you’d need a lot of space to create a 1/12 scale burned out city to go with it.