Hi.
I'm working on this machine for a while now.
dimensions:
legth 100cm, width 85cm(motor to motor) 65cm inside of the uprights.
working area 450x700x200mm(X Y Z)
Click image for larger version. 

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from above quick render i have done:

Gantry, Z plate and base welded + stress relieved.
Z plate and gantry machined to 0.01mm, or should I say: I cant see any twist or bow in them.

Base machined to +-0.1mm, got fed up with machining company and decided to go for epoxy self level cast. I woud scrape it in, but i can't afford surface table big enough to give me reliable reference for this size. I have 600x400mm one i can see/masure twistand dip in my base rail supports.

Gantry and base uprights will be filled with epoxy concrete for reinforcement and dampening purposes.

So far i learned that:
"precision" engineering companies in my area can't measure 0.1mm bow in 1000mm and 800mm long parts and can't machine them flatter than 0.1mm.
What is mystery to me is why they have gigantic granite surface table in their inspection room.
Hand scraping is loooong process but works.

Photos to come soon.