This seems like a perfectly fine recipe. I've never steeped 2-row, but then again I only ever did 2 extract beers before going AG. As far as a lager, I might replace the 2-row with some honey malt and avoid the malto-dextrine altogether. I think honey malt gives a certain sweetness that compliments a medium-bitter beer, especially in a lager. With the hop schedule I think that should suffice for the body you're after.