HDV 25p 16:9 to SD DVD 4:3 letterboxed in liquid 7.1

Hi guys,
I know that a few people have written in the past about how to solve the following problem, however, I need some additional info for my particular editing suite. I use liquid 7.1 and shot my little short film with my HD101 as HDV 25p (16:9). I captured it with the liquid preset "HDV 720 25p". no problems and nice editing. The output requirement is a DVD with SD 4:3 format with letterboxing. Is there a way of exporting the timeline directly onto DVD in SD 4:3 letterboxed, or do I have to go through a few different steps (e.g. rendering, change of timeline properties, etc.) to get to the required result? And of course I'd like to maintain the best quality possible.

thanks for the help