I am a new BVM F-4 owner......I have mine set up like Craig has described, and as I have done on my other planes in the past......I use Tom Cook's JMP sequencer with (2) JMP Valves, using JR 351 servos to drive them.....takes up minimal real estate on one of the component boards just in front of the junction of the right and left limbs of the inlets.....

I use the longer, 5 second sequencer delay on the doors, programmed simply with dip switches in the JMP unit......system works perfectly every time, as it has on many of my sport planes in the past.....

As far as the up assist cylinder, I just have mine T'd into the main cylinder line.....

I have added a single Robart restrictor to each of the gear door closing lines to prevent them from slamming shut.......