Palindrone is a 320mm 6" frame made to hold two HD cams facing front and back. Both cams have a huge range of tilt and unobstructed views. Both cam mounts can take an micro fpv cam on its side so you can monitor the rear facing video if you install two vtx's (the kit ships with one fpv cam mount).
Arms are 10mm x 10mm, with the motor mount area milled out to 4mm thick. Components are fit in the 10mm space between plates, boards can be mounted in tandem rather than stacked.
You can print your own parts, files are here.
Motor soft mounts/arm guards are included in kit.