Both the Liquid Management (LM) slanted plate design, and the Vapor Management (VM) port and gate valve outlet, have reflux returned to the column from the top by a reflux cooler mounted above the head/outtake.
As the name suggests, the LM manages the product-rate and subsequent reflux by controlling the off-take in LIQUID form through a small needle valve.
The VM controls the off-take in VAPOR form through a bigger gate-valve, and uses a simpler design for the head. The VM seems to be the superior design, both because it's relatively simple to build, and because it is very easy to run and obtain top-notch product with.
Heres a pic of my VM-setup as an example:
The reflux coil on the floor goes into the tube above the head, and the head is just as basic as it looks. Simply a valve-controlled vapor outlet. My design is tweaked a bit in appearance from the norm for personal overkill preferences, but it illustrates the point. Change out the head inbetween the column and the reflux coil with a slanted plate LM head as I built over in this thread:viewtopic.php?f=3&t=686
And you've got yourself an LM rig. Of course, the outlet in my LM-head there is not connected to a small needle valve for control of product and reflux rate yet, but you'll get the point and the differences in management principle.
And as always, there's about a million ways to tweak and adapt the designs, but I would suggest that you use 120-150 cm's for the column alone, and get hold of about 50-80 cm's more tube for the head and reflux coil tube.
Read up and look at pictures before you build