Hey guys! I don't know how to build stuff using the programs,but I have first-hand knowledge of what the track is actually like, having actually driven on the track itself. Here is as follows:
From the start line to Hell Corner- The track is at a slight peak at the line, that gradually drops away,with the sides also gradually sloping away.
Hell Corner- The apex of the corner actually sinks down a bit; like an oversized pothole with smooth edges. The exit kerbing is quite narrow,and quite aggressive.
Mountain Straight- an inclination of approx. 45 degrees with a lot of bumps on the racing line (from the middle to the left side of the track). A nasty double bump at the peak of the straight, then a sharp drop, kinda like a ditch,but magnified and much smoother obviously. F1 cars will bottom out here for sure, if the suspension is on default.
Griffins Bend- A slight gutter following up the apex, but you won't see it on telecasts. The kerb is much higher than the actual track itself here, and it's very narrow through here, but also relatively fast. Despite TV showing a wide exit, the concrete wall is up against you here, and the kerb is very aggressive.
From Griffins to the Cutting- Similar to Eau Rouge on the approach to the Cutting, then a blind corner.
The Cutting- As steep as Eau Rouge, if not steeper. Very bumpy on the approach to the second apex. Aggressive, big inside bump on the second apex. The track here is about 1.5 car widths in reality.
The Cutting to Reid Park- Very steep. Even F1 cars will become unstable, as the direction changes are sudden and blind. The apex of Reid Park sinks into the surface; another oversized pothole with round edges. Similar to Turn 1 at Suzuka in most aspects, but with a sharper apex.
Reid to Sulman Park- A series of fast left sweepers. The elevation changes are sudden and dramatic, if you're not careful, even F1 cars will oversteer.
McPhillamy Park- The inside kerbing can cause the car to skip to the outside of the track. Probably the flattest section of the track.
The Esses- The aproach to these corners carries a sudden gradient change, and continues throughtout this tight sequence. The apexes are quite sharp, despite the S shape of the bends.
The Dipper- A bit like a cliff to be honest. Sometimes, you can hear the suspension taking the damage as you almost literally drop down here. Definitely steeper than Eau Rouge.
Forrest's Elbow- A similar corner to Stavelot at Spa, and Brooklands at Silverstone. Combine these two corners together.
Conrod Straight- A carbon copy of the back straight at Suzuka from Spoon Curve to 130R, with the exception of a steeper gradient, again.
The Chase- The approach is similar to the first part of Maggotts at Silverstone. The braking area and the actual corner reminds me of Turn 1 at Albert Park, Melbourne.
Murray's Corner- Pretty much St Devote, but in the opposite direction.
In general, the kerbs are incredibly aggressive on car and driver, the track is very fast and blind,with plenty of sudden (and I was only going 60 km/h; they impose a limit on the public) direction changes.
Hope this helps guys! =)