I could have the smallest "rocket pod" one ready in under 72 hours, just by eyeballing it, from prepping to mold up to first pull.
On that "chin gun" - do I see a screw-head tucked up in a recess there? Being able to disassemble the parts will be a large bonus.
Some of those would definitely be challenging! But overall, *just from your pics,* I think they could be done. BUT! It wouldn't be cheap at all. They have a *very* limited application and appeal, so there's likely little chance for recovering the cost of the mold - NOT an insubstantial expenditure - through volume of sales.