Base for 7 Cylinder Radial Engine

I had a request for the base so .....

7 Cylinder Radial Engine Model
https://www.thingiverse.com/thing:3652570

Motor - 30 RPM at 3 volts.

https://www.ebay.ca/itm/1PCS-DC-6V-30RPM-Micro-Speed-Reduction-Gear-Motor-with-Metal-Gearbox-Wheel-Shaft/401112534797?hash=item5d642b8f0d:g:7-wAAOSw-tNXIXjr

Battery contacts ...

https://www.ebay.ca/itm/80-100X-Silver-Tone-Metal-Spring-Battery-Contact-Plate-Set-For-AA-AAA-Batteries/132256246803?hash=item1ecb162c13:m:mkJvOtDCyI7Jw-VgaXNvAow

On/Off Switch ...

https://www.ebay.ca/itm/10-PCS-Latching-Action-Flashlight-Torch-Push-Button-Switch-DC-30V-1A-SL/233755206014?hash=item366ce5617e:g:08AAAOSwV9ha1HY5