after reading so many MS documents about DSL and watching your movie still it is hard for me to get the full big picture of the technology.
you know that a perfect DSL tool should create final codes with minimum meta data and give the developer maximum customization possibility without loosing anything after re-generating code.
First of all, you need diffrent UI tools to see your model. the current default designer is not enough for all scenarios. and some times a Tree and Grid view is a perfect media to show and modify the model. I know about DSL powertoy but DSL designer needs some basic default editors in place without asking users to add their own editors.