Hi Guys, the F-5 is a great flying jet, very fast but it also lands very smooth. The one down here that belongs to a customer is setup as Skymaster instructions and has no problems when rotating. You need to have some flaps applied so it will rotate more smoothly. The nose strut was not enlarged in any way.
For the doors I recommed having a strong air system and cylinders. If you are not using a bypass the turbine will make it dificult for the cylinders to open the doors after takeoff and at full power. Remember the F-5 gear doors are closed when the gear is open. The one here has two cilinders per door.
Here is a small video of the F-5 in action at our field...
http://www.jetsrc.com/videos/F-5_jetsRC.wmv
Michel