@AmiDelf:
If you want to be able to finish this project in a reasonable time, I suggest that you choose the following route:
1. Buy an AmigaOne/PegasosI/PegasosII.
2. Buy a KyroI/KyroII graphics card.
3. Sign the appropriate NDAs to get the AmigaOS4/MorphOS SDK and the Kyro developer documentation.
3. Write a 2D/3D driver for the KyroI/KyroII graphics card.
When you have completed these steps you will have both hardware and software matching the specs of your project very well.
/Patrik