This is a build of the Avenger215 frame with the arms above the bottom plate (other than suggested which is below). Due to this the build was quite challenging because it is so tight. Above the arms there is only space for the 4-in-1 ESC and the FC has to move to the back. Below the FC goes the crossfire micro and above the unify pro race with MMCX connector where the antenna is directly attached. This save quite some weight saving the SMA connector. AUW is 358g with motor protection.
The nut on the FC near the unify plug cannot be installed as it is in the way. As you can see with the Runcam 3S mounted there is only very small space between the strap and the props.
From the maiden I can say that it flies well and seems very robust. But was the mounting of the arms worth the effort? Unfortunately I cannot say for sure. Compared to a similar AMAXinno freestyle with 28mm standoffs (15mm here) I am probably to unexperienced to feel a big difference. But because it is so low I think it looks quite neat.