I spent a while looking for a 'cobra in 1/72nd to add to the collection, and the pickings were slim. I found this kit from RS Models as a TP-39 Q-5 Airacobra Trainer. Fortunately this kit came with two fusilages and canopies so I was able to build it as a P-39Q.
With 1/48th Monogram Kit
The cobra collection
Bell XFL-1 Airabonita, P-59A/B Airacomet, P-63 King Cobra, P-39-Q Airacobra