Good luck. I had that combo back in the day as well. Many a night was spent rendering all sorts of 3D goodness in Imagine.
During lockdown in 2020 I started restoring and upgrading an A500. My plastics do not look at good as yours unfortunately, but did put an RGB2HDMI and gotek inside the case while keeping the floppy drive in position . I also have some switches, dials, ports and the gotek display added to the case. Some say it looks more like your Ed209 than an Amiga 500
. The only other thing I want to add is an internal hard drive and a paint job like you see on a couple of the machine behind Neil in his RMC Retro videos.
What are planning on doing to your machine?