Not sure what you're up to; there were things in the image nobody had the source code (or the current version) anymore, but even with the source code it was a nightmare; it would undoubtedly have been less bad had I then had tools like I recently built for ST80 and the knowledge gained with them.
That was my personal impression as a trained engineer based on relevant experience, not a condemnation; I on the other hand find it annoying when some people glorify Smalltalk in retroperspective and attribute to it any great qualities without evidence and against better knowledge; nevertheless, the technology is impressive in a historical context and worth studying (but I still wouldn't use it for industrial projects anymore and would also not like to tempt other people).