Have been working quite hard on my textured floor graphics last few days, so far this is what I have for two different texture styles for the desert. Sand dunes and dry desert lake bed. I have also uploaded a sand dune texture without the copperlist on which simulates the depth cueing to a sandy yellow haze at the horizon. The non copperlist image has the palette exaggerated for contrast spread and the final image is unlikely to have those 4 specific colours.
Still a huge amount of work to do before I can get going on a basic engine but the first steps are done at last and I am happy with my source graphics for the texture rendering routines. Creating the seamless textures had to be done by hand and this took me a lot of time. Now it's just graphic artist donkey working to push out 2 lots of 32 frames or something that I can start building a basic flight engine around. The size of the graphics mean the first engine will be in 320x256 PAL dimensions, the NTSC engine will be re-written to to tilt the graphics at a more shallow angle so I can save 40 odd pixels in screen height to make it workable on 320x200 NTSC mode.