Does the moderator think this might be too far along? Finally assembly is required although I don't have a special really huge building for it like NASA does. Pretty much everything needs painting and I'll print new decals for it.
This is a partially built “Shuttle C” vehicle I started far too many years ago to think about. It would go with my finish things before starting new stuff plan.
I have a bunch of other rockety things I could bash together for some whiff launch vehicles.

The pile o' parts.

About what it should look like. Shuttle C was a proposal to reuse timed out Shuttle main engines and recovered SRBs to launch non-crewed cargo vehicles to the ISS and launch satellites and such things that did not need a crew. Without the weight of shuttle wings, tail and crew compartment much more mass could be launched compared to regular STS launches. This way components that were no longer rated for crewed flight could be used one more time and not sit in a warehouse forever.