You are all right about the copyrights. Probably I couldn't use a "Dune" name and any of copyrighted graphics, even the old ones, so let it be like it is as the eyecandy for RTS players and makers
There is some resources to makea new pixelart rts.
There are graphic artists who still make pixelart rts mockups.
There are game makers. There are even 8bit audio makers.
It's just hard to build everything from scratch for one person.
Yeah I miss the good old one simple RTS mechanics in new games too.
I find playing Open Red Alert better than Red Alert 3.
Or Total Annihilation than Supreme Commander, and so on.
More inspirations online:
my Pixelart graphics on polish pix.art.pl service that we are maintaining.
Sorry I'm not permitted to make URL's so had to remove http prefix