Here are some whatif made with my seven years old son

[RotorheadTX]

Tell the kiddo I'm stealing his idea....

And remind him that imitation is the best form of flattery. 

[deathjester]

I love the pulsejet floatplane - that's whiffing! 

[luft46models]

I loved the floatplane , though was expecting German markings given the pulse jet.

William in Oz

[marco]

Thank you everybody!
Well for the jet floatplane there's an inspiration....
http://www.unicraft.biz/on/seafighter/seafighter.htm