it's time consuming to say the least to do it yourself. however very dooable. i had a problem with one of the templates i downloaded when i would change the skins on the placed aircraft they would now sink the bottom of the ship and just float sticking half out of it. (shoulda took a screen) so i started making my own as many others have.
another issue i ran into is depending on where you put things if youre going to have more than one person joining, as my player 2 spawned where a static aircraft was on elevator 2.