Going back to the Arhcer Glider: I like the idea and I support it. Two pages back, I believe, I gave a hand-waving explanation of how it can be used without the need to resort to Crystals or the likes.
For the issue of ballistsics, like all the others said: that simply doesn't fit into the Telepath world, Craig also commented on the aspects on the old forums. Hence the majority is against gun-powder and the likes, . as was the case on the old forums as well.
For the Golem, I prefer best the Bolt Golem version: a ranged golem that fires bolts at people. (So, made from metal itself, it will have some of the bolts stored inside it- I'm pretty sure it will be credible enough, since it won't use more than 10 per battle, typically. And then the bolts can be re-stocked later on- same goes for arrows and the likes.)
With the excavating golem- there is the terrain type issue, which I don't think will be overcome, thus I think the above might be the best we can come up with in terms of rendering a credible, projectile-throwing golem.