Very nice work! The interface editor seems quite lovely judging by the screenshots. I've have a nosey around the source code some time!

A quick suggestion: you could probably get the thing running under Delphi 4 if you remove "variants" from the uses clause where listed and deselect "text dfm" for every form (right-click). Shouldn't be too much of a stretch after that (though that depends on what classes you're using, of course...).