Nice! Always a good feeling to do a mod or upgrade yourself.

Those chips are quite hard to remove. You can get proper tools to extract chips, but hey if a knife works...

I know you mentioned in another thread that you don't have everything in place yet to run OS3.9 on your Amiga. Perhaps while you're waiting you could build an OS3.9 install in an emulator ready to transfer to your real Amiga once it's ready.