Z Axis Bed - Marlin Firmware Configuration??

Hi All,
Im converting an old 3D Systems Cube 2 printer which has a Z Axis bed. Problem is I cant figure out how to configure Marlin to accommodate the Z Axis Bed. Basically this is how it SHOULD work.

**Homing switch for Z axis is at the bottom of the printer.
After homing at the bottom, when print starts, bed raises to the level of the hotend nozzle. (Im guessing I define this distance as a constant somewhere.)
As print continues, bed lowers according to layer height until it hits its maximum Z Axis travel limit.

Does anyone know how I can configure Marlin to make this work? I kind of though it would be easy, but now having tried, Im starting to wonder if it's as easy as I thought.

First post by the way.

Regards
Dan

Edited 1 time(s). Last edit at 11/22/2014 03:45AM by danandmary.

Figured it out, the key was to use min end stops for both x and y, then max for z. Then in the firmware, set invert z dir to false, z home dir to 1, min and max software endstops both to false, then z max length to the maximum print height and use the same figure for z home pos.

Wow. What a marathon I had figuring that out.