There currently aren't any questions under the FAQ section on Nazi economics that directly talks about the Nazi plans for the post-war economy, but there are several threads on the sustainability of the economy in the pre-war and up to the mid-war that you might find interesting:

• To what extent was Nazi Germany's economic development form 1933 onward "unsustainable"? And what effect did it have, if any, on their decision to go to war when they did? - /u/Volksgrenadier makes a good summary of Germany's economic growth from 1933 to the late 1930s in the top comment using Adam Tooze's Wages of Destruction as his primary source.
• How Did Adolf Hitler have the economy to sustain the rearmament of German military in 1935 ? - /u/vonadler deliver lots of specific details and statistics on the money that Nazi Germany acquired during its early campaigns that does well to augment the above answer.
• When Nazi Germany imported goods from other countries, (such as iron ore from the ostensibly neutral Sweden that went into manufacturing Nazi weaponry) did they just print extra money / cook the books with spurious wealth in the expectation of winning the war? i.e. (explained more inside) - /u/peripatos showcases an analysis of early National Socialist import and export policy tied in with the political group's views on self-sufficiency and sustainability.

There is also some more tangential threads about the overall goals of Nazi Germany in the FAQ section on the Axis alliance and post-war plans:

• This top level comment from /u/kaisermatias talks about the vision that was being in the uppermost parts of the Nazi regime for Eastern Europe highlighting the mass depopulation and agrarian hopes for the planned expansion with little reference to the exact economic nature of the matter.
• In this top level comment /u/depanneur talks about the Nazi's Eastern European plans with much greater emphasis on the colonial and economic nature of the planned expansions. The comment thread also has good content below the top level that you may enjoy.

Almost all of this is somewhat tangential to the post-war economic planning in exact detail, but should give a good background on the realities on the ground during the pre-war through the mid-war and also inform about some of the very general ambitions of the Nazi higher ups.