I found a lot of inspiration looking through the
Member's 914 Photos thread... for hours.
In the end, I decided my car was already bastardized too much to go for Concours, factory-perfect... so I'm going with very original look to the exterior (only visible change from factory is Euro taillights and the Manta exhaust that I'll someday replace), while making some modest performance/safety upgrades to things that don't change the appearance.