Treehugger
I know Alanger has a model in 1:350, but I rarely find it on eBay and it is ususally too expensive for me. Like all submarine kits, they are very very simple, not really worth the price imho. The models do look good when painted.

Treehugger
The rear part reminds me of the Oscar II sub, but I guess they must be different designs.

Oh, here's an idea. For any hovering heli, if you had a rope going down from the heli onto the deck you could use the rope in metal wire, to hold the tiny heli model up in the air.