There is no aftermarket resin for either UH-60A medevac birds or UH-60Q acft. The standard NATO litter will fit laterally in a UH-60 at the cargo doors as this is the widest part of the cabin due to the lack of cabin bulkheads there.
As far as I know all U.S. Army medevac birds that are not Q models are A models. The main visual difference from an A to an L is that the main landing gear fairings are narrower on an A model due to the lack of vibration absorbers inside.
I flew for around 10 years on medevac A models at FTCKY and was part of the active army team that did the testing and verification type stuff for the Army with the UH-60Q. I also would also like to build a A or Q model medevac and for the time being it looks like scratch building is the way to go.
Lemme know if I can answer any ?s on UH-60 / (army) medevac type stuff, I'm happy to try and help.
Mog