Incorporating Expansions into Tournaments

So we've been having an ongoing discussion after a comment at the end our our last club tournament about how to run a Planetstrike themed tournament. This got me to thinking how poorly these wonderfully thought out expansions fit into the tournament scene.

The obvious problems that came to mind when we started thinking of a Planetstrike tournament was the issue with modified force organization. That means that we'd require the players to bring potentially two lists, one for attacking, and one for defending. This might be too much work for some players. Then beyond that was the issue of bastions/objectives. The defender gets to setup and determine terrain/objectives. But what happens when someone tries to place 10 objectives, or 1 very upgraded objective. If we restrict objectives to a set number, then some armies get an unfair advantage. If an Ork horde only has to swarm 3 objectives as the attacker, they are likely going to win. So the best recourse is to allow 2-6 objectives at most, but then generates another issue. Without a set number of objectives, strategems will change each time.

Needless to say, it's something I'm still working on, and have a few months to figure out since I'll run it if there is interest(mostly to remove the unfair 'always attacker' Dark Eldar from the mix). But it got me to thinking on how easy a Cities of Death tournament would be to schedule at some point later, but I started running into the same problems. I've tried to puzzle out most of the Planetstrike stuff myself, but have hit the interwebs to try and find if/how others have done this. So far there's been very little, and most of the ideas I'm having are mirrored in the rules/setup I can find.

My biggest hang up is that when I think about what I'll do for my tournament army, it goes pretty far (even though I've yet to make a good display base), but I'll be the first to admit, I'm not the average gamer. So what is too much to expect from them? Should I expect them to build their own bastions, or at least their own strategems? Where do I draw the line on extra stuff that doesn't directly impact the game? Because we are a smaller playerbase, this is a big question for me when I'm planning anything.

Anyone had any experience with the non-standard tournaments? What have you noticed as a player, and what is too much to expect in your opinion?