Good man...things can be welded by novices (me!!!) but still precise as long as either some form of adjustment (shimming the top rail on the x axis for exampke) or the epoxy method is employed.

Yes you can still use your design if you look into the gantry a bit more. Bracing is your friend as wood needs to be cut quick so on full chat your machine will be dancing about (how you fixing it down by the way?) all over the place...

The best way to get stiffness in your gantry is to keep the sides as short as possible with the best being to mount it directly on the linear carriages...this needs raised rails.....

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