They want the tool supplier's model first. We have dimensions but no model. Is a provisional envelope worth doing?

It can help reject obvious conflicts if the designer records its assumptions. It cannot establish the finished arrangement. Include items such as fittings in that discussion rather than assuming the supplied main body dimensions describe everything nearby.

Requested the envelope with assumptions stated. Tool supplier has been asked for the complete definition. No base location signed off from this

Let the setter mark their required access on the same layout. That can make the comparison useful now, while the detailed tool information is still being collected.

And give that marked version to whoever does the next drawing revision. Don't make the setter explain the same space again because somebody started a clean copy without the notes