Not so sure the figure 8 is a wise thought. You can do alot with 1000' the 50' will prvide two lanes, one each direction. When you mentioned "track" I assume your tinking MX. If so, build your obsticles whereas it can be ridden by a novice and a more experienced rider. Example would be a table with a jump in front where the novice can jump on and the more experienced jump over the combination... follow this up with a triple where the high speed guy/gal clears the table does the triple the other will roll off the table double in and single out. At one turn you might consider a bank the other off camber. A long rythm section is beboming popular so 6-8 jumps spaced 25-30' would afford each level rider to double, triple or any combination. A step-on with a lip into step down into a triplle would be interesting as well proiding many different decisions. Point here is you can do alot. As always thing about drainage and trck maintenance. At least you have tools to work with. Have fun building your track and be flexible... tracks change with experience.