I don't think anyone has hit a limit as to how much scenery can be installed. Suffice to say, it's lots.
More likely that your problem is an installation error. Check the readme's and installation instructions carefully.
After you do it a right few times, it's easy. Just ask again if you aren't clear on it, or need more help.
Mainboard: Asus P5K-Premium, CPU=Intel E6850 @ x8x450fsb 3.6ghz, RAM: 4gb PC8500 Team Dark, Video: NV8800GT, HDD: 2x1Tb Samsung F3 RAID-0 + 1Tb F3, PSU: Antec 550 Basiq, OS: Win7x64, Display: 24&