Big Baby is a 150mm X8 for 3" props. It has a 4mm base plate and a 2mm top plate. The motors are stacked using low profile 2mm catdog mounts. Stack height is 25mm (leave me a note if you'd like 30 or 40mm instead), which fits 2 4in1's and the fc. The Lumenier Lux7 is recommended for X8's. The frame is drilled for 2 30x30 and 20x20 stacks.
The fpv cam mount and antenna mounts wedge in the DJI air unit.
I'm running 1407 2800kv's with a 850 6s.
You can print the parts yourself, files are here. If you'd like me to print the parts they can be red, orange, blue, or clear. Leave a note if you have a preference.
I'm calling this a beta 'cause I'm not sure why this little guy needs to exist, other than fun, or a tiny cine platform that can be as fast as a 5". The frame design is pretty solid and I don't anticipate it changing much.
Read more about it here.