Search:

The base is not so much an issue and easily sorted with bracing or like Robin suggested stiffening with panels.

The tall narrow gantry is the biggest weak area I see and is where all the action...

Ok I'll shoot first.!!

Please take what I'm about to say has help rather than pulling a design down.!!

That gantry is miles too narrow and it 99.9% will twist and rack even if you use 4...

You could turn the open frame into a cupboard to keep your knick-knacks and controller in. If you cut Melamine faced board to a good fit on 3 sides it would make that base totally rigid.

Beware...

Thats great because I'm sure were going to give get plenty before your done. . :joker:

I hear what your saying regards usage but still that Gantry has Mass which will try to bend and twist the...

Think you'll find he's correct and Yes I am familiar with your materials.!!

What your not accounting for is the Mass of the gantry and it's inertia.?
It doesn't so much matter what your cutting...

Don't listen to Jonathan, he's still learning :wink:

Use http://www.beltingonline.com/5mm-htd-timing-belts-4575 for belts and pulleys, more choice and cheaper.
good service as well