Yes it is, although I scrapped that idea as the doors would not close. Right now I am using a string-based system as diagrammed in "landing gear doors" I am having trouble getting it to close completely, as my cylinders don't have enough oomph. I have a _old_ set of 615s - ones that have a plastic cylinder. Robart offers replacements, although I don't know if that will help.

I'm a spastic builder, so I am working on other parts of the plane, even though I have not solved that problem to my liking. I am currently working on the rear gear door, which I think is working better. I am using two short pieces of pull-pull wire attached to the landing gear.