Originally posted by B and M
The biggest things i can think of are Make sure your G's dont go into the red. Shaping matters alot to. Make sure your hills are shaped correctly or else they may pull bad G's and look bad. When building a ride remember the more speed the more banking. Make sure the track NEVER comes to close to other pieces or other objects, this could kill someone. Also pacing is important. Pacing is how well the ride is apced. Its difficult to explain but its an easy concept. You dont want a ride crawling into the station for example but you also dont want it flying into the station at 60mph.
Also, what do you use, rct 1,2,3,? nl, sm?
Considering this is in the NoLimits forum, I'm guessing that.
TopThrill
If you want to handbuild, Just keep practicing.
If you want to build with a program, get Newton2 and learn it. Best decision I ever made.