Magritte3 and custom renderers

All, I'm currently hitting some roadblocks where I think I'm missing some general understanding of Magritte/Seaside. My current goal is to make Magritte using Twitter Bootstrap. However the ability to provide #cssClass and custom renderers seems to only achieve mixed results. Mostly because some MA* Classes implicitly use other MA* classes (i.e. MATable depends on MAColumn ...). I feel like to create a comprehensive Bootstrap usage I have to duplicate most of the MA* renderers (hierarchy). So I'm wondering whether I missed some functionality to plugin custom behavior into the hierarchy or whether the provided hierarchies are "just" an example which only can be customized to a certain point. Everything beyond has to be done "manually". Best Regards, Udo