tristan:
1. you select the glass part polys, and detach them as a new object (and edit the glass if it needs any more editing), and then u edit the ex.glass polys on the main body, do make the lamps. (my english is bad, msg me on msn if u need any further help)
2. you can use target weld, and weld them vertices one by one, no matter how far the one vertice is from the other.