Okay, here is an attempt to address the issues with the circuit:
Firstly, I tightened up the first corner ever-so-slightly – and smoothed out the next two – to try and encourage overtaking.
Secondly, I reprofiled the southern end of the circuit. Where it was a sweeper into a sharp corner, now it’s a sharp corner into a sweeper n the hopes of offering a secondary overtaking point. As a result, I’m not happy with the next corner, but it was a sacrifice that had to be made. I straight-lined two of the Esses to let the cars build up a bit of speed in the hopes of remedying it.
Next is the msot radical departure. I didn’t want to do it, but I had to turn the circuit into a figure-of-eight. Without natural elevation – like at Suzuka – I’m not sure how the fly-over could be done. But it was necessary to create the “Nueve Peraltada”, that 180-degree bend in the middle of the infield. It’s smaller and tighter than the original, but I imagine that you could play around with the banking to minimise the impact. There’s also some space to make it larger; i just drew this up quickly.
Finally, I wanted to create another major overtaking point. I had to throw in a pair of extra Esses, which I modelled on the fast chicane in Melbourne (I call them Ricardo and Pedro, after the Rodriguez brothers). Not only does this offer a challenging pair of bends, but it lines up perfectly for the gap in the old baseball stadium grandstand. The gives a sharp right onto the old Peraltada, which is now flattened given the presence of the new corner.
There are a few issues with the circuit, though. There isn’t enough run-off on the outside of the right-hander before the new Peraltada. It might need to be redone as a slower, double-apex bend. The circuit also cuts out a fairly large slice of the paddock area, but I imagine that this would need to be enlarged to accomodate the modern Formula 1, anyway. For novelty value, the paddock could cover both sides of the circuit; I think it would be pretty neat to see the cars tearing along between the team transporters and motorhomes.