On line catalogs tend to be labors of love, by individual collectors. The brands typically do not support the effort. Those individuals have to first collect the catalogs (buy them), then scan them, then create a website and pay the cost to host them on line. Many brands do not have that individual. There are plenty of opportunities for people to step up and help the cause.
For example, as I recall, the guy with the vintage Cannondale site had Cannondale attempt to shut him down.....
Me, I'd be willing to pay a little for that frame with the headset, crankset, and bottom bracket all in place.