Hi Alan
You will have the A4 build over a few nights, if you need servos, Richard does a range of 1.8kg mg servos, I use them for all my small models. The model will go together great, the only problem I had, was with the decals, water slide transfers, they just will not stick to the foam, so I got a few plastic type sticky back which done the job great. If you are going to paint the model, use the test pots (water based) which you get from the local paint shops, then use a water type varnish to finish, cheap and easy to use system, as used on my Mig 29.
Hopefully you will have the model ready for the PSS, would look great in the air, if there were two A4 skyhawks flying in formation off the slope :clap: