Now that you've got it all worked out, Bobert, the two of you'll be much better placed to do the whole 6 acres as garden. Don't laugh; several people I know have done 5 acres and some have done 30 acres. In Oz the ABC televises "Gardening Australia" (a half hour program, viewable on-line) and they regularly feature the efforts of people who've tackled such areas as yours.

You'll never need to mow again.

Cheers, Rowan