-agree with phade on the funnel comment, your thank him when the rut comes and bucks are cruising.
-How deep is that water in your pic? big deep drainages can also make nice deer funnels. If you can figure out places where they like to cross, when not pressured, you could have a dynamite stand.
-Fixing on the producing oak trees is a great tactic, provided there is enough mast. In a year with a bad acorn crop, you could be hurting if thats your only food source with stands on it, have a plan b and trees ready for if they are on the other food sources.
-id have a few different stand locations picked out around that corn field for different winds. closer to the season you should be able to glass the fields from afar and figure out where the bucks are entering the field, and at what time so you can be set up on the deer from day 1 of the season, when they are still patternable. i spent 10 days end of september last season glassing and killed one of the 2 bucks i had my eye on the 5th sit on that field.
Goodluck