Starlink Dishy flat mount with provisions for the Boondocker PSU, Raspberry Pi 4 as a wifi router, and a DC converter. Printable on a ~200x200 bed. 12dc powers the unit.

Various instructions on the interweb on each of these items. What is unique here is my 4 piece mount. Glue the 4 pieced together.
You can use this mount and an external DC 48v driver and just run the ethernet cable out of this unit, or put the electronics inside this unit and just put 12v to this. 
Good video on an external set of power controls using the Boondocker PSU  https://www.youtube.com/watch?v=RlENmAikSQQ&t=6s
Or a simple 48v converter to power the starlink router https://www.youtube.com/watch?v=jv_IoKRoVsA&t=273s

Provisions for an o-ring for the lid, although you might not need that.
You can make what ever provisions you like for the mount like feet included here, or magnets, clips or what ever.

Boondocker Dishy Dualie DC https://boondocker.io/products/dishy-rv-power-supply
Raspi 4 get wherever along with a USB wifi, short sma extention, and sma wifi antenna.
LM2596 DC converter takes 12v to 5 to power RASPI on IO ports.
8 M6 heated inserts and screws to mount your flat dish to wherever
10 M3 screws for mounting the 3 PC boards to the lid
12 M3 heated inserts and screws for the lid to the mount
.139" / 3.53mm nitril o-ring optional.

Cut dishy to the vent holes.
Print mount
Fit mount and trim as necessary for any insert or screw clearance
Glue 4 bodies together. I used 3M 5200
GLue mount to terminal. Also used 3m 5200
Install boards and power wires per manufacturer instructions
Install RASPI 4 with wifi dongle supporting AP mode and configured as wifi repeater and SMA extension. Bulkhead fitting in mount to antenna just screws into the outside.
Short RJ45 Ethernet from PSU to RASPI

Or just run the Dishy cat terminal out of the unit and connect you your starlink router as seen in the video above.