As far as I'm aware the bridges are fully adjustable and you can take out the bits you don't want to make room for stuff you do want. I also don't think it'd be
that hard to clean (depending on how heavy it is) as it would be a bit like cleaning out a rabbit hutch - as long as your hamsters don't pee on the wooden bits (mine don't pee on the wooden accessories they have in their cages!) they wouldn't need washing that often.
This reminds me of the absolutely superb, huge and very natural looking habitats I've seen from Germany and other continental European countries. If I could find a bargain 80cmx60cm one I'd love to try it and make a big display hamster habitat in my living room!