I found Olav Kallhovd CG scale on Github (https://github.com/olkal/CG_scale).
Unfortunately the mounts doesn't fit to the small depth wings (like F5D models have) as well not to larger fuselages.
So I created a modified version that wings with small depth could be bring on (like F5D). If needed additional pin hole in front mount for shorter leading edge distance (see example picture: the small pins). The rear mount can be turned for longer distance / depth wings.
Width of mounts is enlarged for bigger fuses (Up to models like 2.5m Swift)
Distances need to be adapted in adruino sketch, my sketch can switch between different modes/distances/scales.
How I solved the Arduino stuff and code can be found here: http://www.koelleteam.de/wordpress/baubericht-elektronische-schwerpunktwaage/
Disclaimer: This part is to be used at your own risk. I would not be responsible in case of injury, physical damage or improper use of these files/ planes and how they are used.
For more composite RC plane stuff & fast planes visit my website: cfd.koelleteam.de