Oh noo xD it didn't post it o.o
oh, well - I'll see if I remember everything
Just because the limit says 500 and you have 250 it doesn't mean that you shouldn't reduce it further?
Are you sure there's only 250 in your entire scene..?

As far as I can count on 1 single side of the bridge there are +60, and double up - for the other side, and plus the 'stop' and bottom I see WAY more than 250...
2nd of all, we have a whole topic for requests if you need any work

And requests should work per PM.
It wouldn't be cool if this topic became a spam-topic
And about the destroyable wall?
you COULD make small pieces of the wall and put together in small amounts of bits 'till it in the end looks like a full wall after grouping in ZE

of course adding and .odf and all will also be necessary as well as health to them.
Also keep in mind that there's really no gravity on the objects in case you think you can blast and hole in the bottom of the wall and see the entire wall collapse down.