I have a bunch of lattice and used it one summer. It breaks pretty easy. You might be able to use it for part of your drop in, but I would definitely buy enough Msnow to at least do your lip. You can always buy more and improve your set up.
If you use turf, and construction fence you will ultimately end up paying more in water and soap to make it fast enough. It can also make your PVC rail unpredictable.
Fact - no man made material is as fast as snow, so the more the ski comes in contact with the surface, the slower it will be. Msnow is fast because it minimizes the contact points between the ski and the material. Ladder style drop ins work on the same principle.
Msnow takes a lot of the guess work out of it and will save you a bunch of time. It is also the best thing for setting an edge on, so you can 270 onto your rail easier.
Go look at the videos in the Build-A-Jib 101 cult to get ideas on how to build your setup. Pay close attention to the tranny. \_/ = not good. Needs to be super smooth and mellow from down to flat to up.
Luck to you.