Hi,
Development branch in git repository contains few interesting targets F4 for example
git clone https://bitbucket.org/librepilot/librepilot.git
cd librepilot
git remote add mindnever https://bitbucket.org/mindnever/librepilot.git
git fetch mindever
git checkout remotes/vlad/omnibus_f3_f4
I am flying two stacks: Emax F3 Magnum and HGLRC F4 XJB F428 Tower.
See attached pictures. The F4 build is running LibrePilot from the mentioned branch. The F3 build I will switch to LibrePilot soon, to test new code mindnever pushed.
I really recommend HGLRC F4 tower with new BLheli32 ESC (currently out of stock on BG). With Emax one I had some problems, it does not do claimed DShot600 and has some wired behaviour.
I do recommend 1106 motors from Emax though. They're very well made. I use 4500kv version to run 3S but you might consider 7500kv (out of stock on BG), to run on 2S. Also Gemfan 3 blade 2040 props with two holes for mounting them I would recommend.