One thing I would like to do with a new Denise and DAC is allow my Amiga 500 to work with 31.5khz without a flicker fixer. How internal timing would be affected is beyond me.
The next is a chunky mode for better speed.
I wonder if a reworked paula could mean 1.44 mb pc floppy drives.
If Natami could become some replacement chip for older machines or even a replacement board it would be fine with me too.
Here is a crazy idea, replace the Kickstart with Aros Kick. and redo the Denise. I do not know how that will turn out :-D