[seabird]

I strongly encourage you to try and achieve this in less than 24 working hours with the hardware and software that was available at that time. Even if you "cheat" and use high-end workstations and ~25 years of new knowledge and hindsight, even a talented programmer would likely struggle with this problem for multiple months.

[ffhhj]

Hmm, tech from '95... using VESA BIOS extension and high/extended memory modes, you might be able to modify Doom source code for the optimized 3D operations, but you'd still need to create a LODed-megatexture database and an API to serve it, unless you want users to "Insert CD 23 and press Enter".

[ant6n]

Haha, just do a planet sized doom level. Easy peasy.

[flohofwoe]

Good luck trying to do any sort of 3D rendering in Doom ;)