Building

Set FOUNDRY_VTT_DATA_PATH if you're using Linux.
npm i
npx gulp

Installing

Paste "https://raw.githubusercontent.com/gulbanana/fmmua/master/src/system.json" into Foundry's Install System window.

References

Strike RPG
Foundry VTT

Recommended Modules

Vance's Sidebar Resizer - power cards look better if you increase the width a bit.