Joseph, you're doing an amazing job on this conversion! What I did with my Falcon was different, in that I tried to take reference of the large scale model and then reproduce it as its "little brother."
For scratchbuilding, what I began doing was looking at tons of reference pics and trying to break each detail down into its component parts and then try to replicate those as simply as possible, beginning with the simplest base geometric shape and then adding on top of that.
Take this pic for example:
On this docking ring, there are about 140 individual pieces of styrene and wire. That's not including the surrounding cone, just the flat face. I'm not claiming to have replicated the 5-footer's detail 100%, but I think it captures the feel of the ILM bird.
But many of those shapes are just simple strips/blocks of plastic, assembled to build up the detail. It was a long process, sure, but if you try to imagine each portion of your details as their simplest components, you can build something that replicates it pretty convincingly.
Hope that makes sense!