Thanks for the comments.
I'm kind of in limbo between 15mm and 28mm. I have very limited space and a new born so 15mm works better for me currently but I do love 28mm too. So I'm thinking small scale projects in 28mm and larger army based projects such as this in 15mm. If you look around the options really are endless in 15mm though and lots of the manufacturers work really well together.
I am facing some of the same deliberations. My current thought, as of yesterday evening, is that I'll try and do a single Lion Rampant force in 15mm to see how I like it. If it turns out well, I'll propably go ahead and buy that Crusader/early Feudal knight-heavy army I've always dreamt about but never felt like painting and buying in 28mm
I think I'll try out your/Dalauprors multibasing system, since it looks absolutely great on these pictures.Though I am also tempted to just use DBA basing, to allow for hames of DBA, Warmaster and Mayhem as well. It just looks a bit naff, especially compared to your guys.