Since this thread's back, and it's been a while - a quick summary of recent engineering progress in Colonia:
G5 upgrades are now available in Power Distributor, Heat Sink and Frame Shift Drives
G4 upgrades are now available in Power Plant, Plasma Accelerator, FSD Interdictor, Point Defense
The following bubble engineers now offer no blueprints not available locally: Palin, Sedesi, Vatermann, Dekker, Qwent, Martuuk*, Dweller* and Jean
Only 9 blueprints remain below G3, and Surface Scanners are likely to reach G3 this week (which will complete duplication of Farseer's capability)
* Required for access to a Colonia engineer, though