1.How can I tell units to move along a path?
2.How can I make a street "walkable" for units but forbid the player build buildings on ?
I fear that you will not like the answers to these questions...
1. You currently can't. However, GAE is merging Glest, and once lua is implimented, they hope to add new features including a way to walk to a place on a grid (x,y) format. Hopefully there will be some way to check a units location as well, so to see when they reach it, we can add in another coordinate. However, this is not yet implimented, but will hopefully be by the end of summer.
2. I am sorry to say it is not possible. Perhaps in the future we could have the streets as a 'building' using a suggestion made by someone on GAE board which they suggested the ability to have cellmaps that can state wether a place is walkable, buildable, or not. However, that is unfortunately not a priority, and GAE was mostly unmoved by it. Perhaps if you present your example, they will think about it a little closer, but again it would take lots of time, and we are very short in programs (we have 2 active).
@Modman: Sorry about the mixup. It was posted by your acount (i think) and I can't keep track of you two!
Also, I think you'll be able to do modeling well, and I'm happy to help. After military, I plan on updating the Glest Guide's modeling, texturing, animating pages, as well as add in GLADE and GAE pages. I realized that as I get better, the modeling/animating/texturing seems poor and outdated. I also plan to unbias the texturing page, which is more of a paint.net tutorial than a texturing page. If you can wait until I finish military and get those pages done, I think you'll be nicely rewarded!
The modeling/texturing/animation paeg will be simplified, use better techniques, and have more images. They will go by the moto of 'Learn to Model or Bust!'. I hope to make them as to GUARANTEE that after completing a series of tutorials split into steps, you will be able to model. Of course, I expect a time requirement of at least 4-6 hours... Paltry sum to learn to model!