appealing perhaps... time consuming, annoying, arduous, painstaking - those are other adjectives for getting a bridge from start to fully functional ingame... lol
What about...
Fun, learning experience, team effort, amusement, rewarding? Difficult, yes... yet also rewarding in the end.
That's looking great, Baz.
Edit: A lot of those edges could use some chamfering, though, IMO, and some stuff could be smoothed. :] Still fantastic.