The website is nice, although in Firefox I can only read the lower half of breadcrumbs.
I can't tell very much about the project itself
To answer the title question, this is usually my concern:
You can now customize your source code locally, in the way you usually do and commit it on your own repository, but to generate or edit new tables or pages of your app you can do it easily from the Skaffolder interface and generate the new files without overwriting your own custom code.
Maybe that works for new pages, but what about changing existing pages? My past experiences with code generators haven't been good in that regard, either you generate only once then customize, or you never customize and generate as often as you want.
Of course there's also use for a generator where you don't change the result, but the market for simple-site-generators is fierce... Best of luck though :-)