no the spacers so not affect the strength AT ALL. On one side of the chassis there is spacers that go in every place a screw does. So the chassis has no WEAK points from not being secured.
looks good joram. If you got it from mike he will hook you up. I was missing my servo plate brace when i got mine and i had one in a day. Mike is real good about that kind of stuff
also make sure you have a good servo or servo saver with those rims. They are heavy and strip servos out like butter. I wound up selling mine when i had them.