Right, this might not help, but when I was following Atkins way of eating I used to make lasagne using pre-sliced cheese in place of pasta. Just layer it on the same way as you would the pasta sheets. I'm sure you can get some low fat versions of pre-sliced cheese (Leerdammer etc).
Alternatively, use sliced veg e.g. aubergine thinly sliced, or tomatoes etc?