ShiVa offers a better workflow esp. for your case, zwecklos:

. you can import lightmaps from 3ds max directly into shiva see the tutorial
. shiva offers you built-in ambient occlusion calculation for more realistic lighting
. setting up the materials is more than 100% easier than in 3dgs
. you can't yet run a7 with AA and PP effects
. ShiVa offers you a preconfigured framework, all you'd have to do is drop in your objects, assign the materials and press "play"

so all in all, i'd say you could create the same demo with nicer PP effects and running much faster (plus cross platform in a browser of your chioce) in literally a fraction of time. and that is what counts. it is, to quote you, all drag and drop for such a simple thing as architecture viz.