There is a bug that makes workers not see elevators. They just stand their waiting for me to build it, but it's already there and other workers are using it.
Wow beat the boss on the first try! Thanks for the advice, I know I couldn't have done it with out it. But I would add a little to what Donatien said: Before destroying the tower upgrade your mana to 9999 and make sure it is 100% full. And also, just in case you were wondering (as I was) the final boss pops out after destroying the final tower, and you use the hobbits to stall him from getting to your base. Thanks again!
This will be done in the game soon, thank you for the great idea :)