A focused technical conversation about one decision — not a general introduction and not a sales call. You send the pre-read material beforehand so the session starts with the actual problem rather than with context-setting.
The deliverable is the written output afterwards: a marked-up version of your document with comments. That is yours whether or not you engage Mateo for the follow-on work.
If you do not have all of it, book anyway and say what is missing. Turning up without material is still more useful than guessing at a scope on your own.
16 years delivering fea structural analysis and pressure vessel design work for automotive and consumer products clients. I work to EN 13445 and ISO 9001, deliver in GD&T and SolidWorks, and hand over a complete, checked document set with a clear design basis so your reviewer or authority can follow every assumption.