Try googling the words "DIY front alignment" for tips. Using string to compare front to back won't work because if the track is not exactly the same front to rear the wheels will end up being toed in or out. The track width isn't the same on Fieros front to rear. Toe is the difference in measurement between the front and the rear of the tires. If the tires are toed out, the front measurement will be larger than the rear, etc. The most accurate way to do this at home is to make a tramel bar, that's basically a board with a fixed pointer at one end and an adjustable one at the other. The pointers can be triangles of plywood, the adustable pointer can be C-clamped in place. Jack up each of the front tires so that they'll spin, spin them by hand and rub a piece of chalk (or use paint, etc) on the center of the tread 1/2" or so wide. Then spin each tire and hold a sharp item such as a nail or blade against the chalk/paint mark to scribe a very narrow line. This represents the plane of the tire. After doing each tire lower the car to the ground. Roll the car back and forth a foot or so while turning the wheel, this will settle the suspension. Don't roll so far as to obliterate your scribed line. Now for the tramel bar: The bar rests on the ground and the top of the two pointers is equal (approximately) to the height of the wheel center to the ground. Place the trammel against the rear of the two tires with the fixed pointer lined with the scribe on one tire, adjust the other pointer to align with the scribe mark on the second tire, then lock it in place. Move the trammel bar to the front of the two tires and align the fixed pointer with the scribe mark as before. Measure the distance from the adjustable pointer to the scribe mark. The difference between the two distances is your toe. If the front distance is 1/8" less than the rear distance, then you're toed in 1/8". Generally, toe out causes quick turn-in but the tradeoff is the car feels squirrely and wanders. Toe in makes the car track nicely but it doesn't feel as responsive. Too much of either causes extreme tire wear.
Now, if you want to use strings what you do is to set them up parallel to each other and then parallel to the center of the car, then you can measure to the scribe mark on the tires front and rear to determine toe. Note, almost all toe specifications are to the outer diameter of the tire, not the rim of the wheel.
Another way to do this if you have a really flat floor is to paint or draw parallel marks on the ground and then use a square to transfer the center plane of the tire to the ground, then measure from there to the painted/drawn line. There are lots of ways to determine toe. Camber is fairly easy, use a camber guage from some place like Sears, for instance. Caster is a bit more complicated, but with the math tables and two steel plates with grease between them to rotate the tire on you measure caster as well.
JazzMan
