Homebrew PCBs

thanks all..

i think today a lot of very good and helpful tips were written.
please excuse that i don't answer each suggestion in detail for itself but
this is because they all were pretty clear to understand and need not much 
comment.

I think i will use allthread, like planned, for now, because it is really 
easy to get.
but be sure i will keep an eye on ebay. Another question, stainless 
allthreads, are they really better for continous use?
i had to fasten some stainless nuts on stainless bolts a few days ago, 
there was more friction
than with rusting bolts/nuts. Is this eliminated by lubrication? Is it much 
better to use stainless
allthreads?

I feared flexing a lot and thought about supporting.
(thanks les for providing numbers - i really had no idea how much it may 
be)
It finally depends on the rail material i get if it is needed.
When the stainless pipe is useable it may be sturdy enough by its own (i 
just can't imagine
a 50mm pipe bending on shorth length).



I also understand now better it is more important to try it with something.
It is impossible to get it perfect the first time.
I will use the parts i already have, or can get most easily, and use them.
When the problems occur i will have to solve them.

st