Looking good but two things are missing/wrong - no 2,5Gbe and no passive cooling. Surely 9/15W can be passively cooled especially with aluminium body... With that blower style fan, it will be unusable (loud) in few months time.

Agree with Pepehl, at least both 2.5Gbe and passivec cooling and this could be consider as pfsense, OPNsense, ... box