Do I really need to salt and bake the eggplant slices? both steps are important for removing excess water from the eggplant and softening it up. Nobody likes lasagna soup (nor dense, chewy pieces of eggplant that are tough to eat -- and cut!) In short, you don't want to skip these steps.
Can I use Cottage Cheese instead of Ricotta? I love cottage cheese and prefer its taste in lasagna. The issue here, again, is moisture. Ricotta is a dryer cheese that seems to work better with a vegetable based lasagna. If you want to use cottage cheese, I recommend cooling the lasagna fully and then slicing and rewarming. Otherwise, you may find it a little wet and tricky to get clean slices out of the oven.
My eggplant slices don't fully cover the surface, does it matter? I found that 3.5 center cut slices across the width of the dish worked well (tiny gaps but no big deal). If you have a larger gap betw slices just cut that shape from a leftover piece of eggplant to fill the gap. You can also overlap a bit.
Are thicker eggplant slices okay? I recommend about ¼" thick - if the slices are too thick, they won't soften sufficiently and will taste dense/chewy and will also be more difficult to cut. Boo.
Why doesn't my mozzarella cheese topping look like yours? what kind of cheese did you use? Low-fat/fat free mozzarella cheese does not melt well - it turns into a sheet of plastic with burnt edges. Double boo.
I'm having trouble cutting the eggplant noodles, send help! Eggplant is denser than pasta however 3 things will help: (i) pick eggplants that are not overripe (they should be fairly firm to the touch in the center, giving way slightly when gently squeezed and springing back without staying indented where your fingers were) they should also have some weight (not be too light for their size).
Overripe eggplants will often be brown inside (a sign of rotting) with a more pronounced bitter taste; (ii) be sure to sweat & bake your eggplant per instructions; (iii) use a sharp knife or pizza cutter wheel and make the incisions fully (slicing back and forth) before attempting liftoff from the pan - this will help avoid getting hung.