you do not need a engineer to draw up a foundation plan for a small job like that. Engineers and ar****ects usually only get involved on general construction jobs, when houses have post-tension slabs, or if custom homes are exceptionally big. I have built houses up to 2200 sqft with just rebar and wire mesh, however most houses we built are post-tension slabs. A typical house footing his 24'' by 24'' with mesh stands in the footing with 4 strands of rebar running through the stands throughout the entire perimeter. From what your describing you are doing you should not need interior footings, I hope this helps.
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