After considerable research into different options for laying my floor I eventually settled on a straight up copy of what the guys at moreysintransit.com did.
I strongly considered two other options:
Van William's cargo conversion. The downside to this method was that he chose to drill into the base of his van to secure the floor, something I'd like to avoid at all costs. Additionally the number of steps (dados, etc.) that he used seemed overwhelming to me as a total novice, although I'm sure these could have been skipped.
Thanks to the great climate in California I'm lucky to be able to cycle to work every day without too much thought about the weather. The van will be primarily used for weekend trips but also as an "occasional driver". Since I'm not living in the van long term the RWB & low roof were compromises to make it more practical day-to-day.
I'm into rock climbing, photography (particularly at night), walking and generally hanging out in nice places. This just means that a large living space isn't top priority as I plan to be in the van only to drive places, briefly in an evening after the activities, but mostly to sleep. Therefore it'll be a relatively simple conversion with a focus on the basics: road noise, heat insulation, airflow, light, practical storage & sleep comfort.
At the end of February I bought a brand new 2016 Ford Transit 150 cargo van. More specifically it's a regular wheel base (130"), low roof with 60/40 side cargo doors. Extra options include cruise control (essential for any sort of long distance driving) and an upgraded 6-speaker stereo with Ford SYNC. Of course it's in a classy "builder's white".