Well this was interesting. As someone who was actually building similar website in the late 90's I threw this into the Opus 4.5. Note the original author is wrong about the original site however:

"The Space Jam website is simple: a single HTML page, absolute positioning for every element, and a tiling starfield GIF background.".

This is not true, the site is built using tables, not positioning at all, CSS wasn't a thing back then...

Here was its one-shot attempt at building the same type of layout (table based) with a screenshot and assets as input: https://i.imgur.com/fhdOLwP.png