I am lucky in the sense that I don't have to make a living out of the work I do for others in the aircooled world and I have some sympathy for those seemingly burned by restoration people.
Some facts: I have not met or seen a rich restorer.
They all have their own projects on hold sometimes indefinitely
I have not met a customer who doesn't feel it is his prerogative to change the scope of work partway through the project ( a good friend told me that a customer changed wifes and the new one didn't like the colour...... He was expected to repaint at the previous discussed price.
Some parts are impossible to source and if the car has been dismantled by an inexperienced person......... Lets just say not good.
I have found the best policy is to find that customer that accepts what you do and how you do it. that said If I were to make a living out of it and I plan to do it someday so I am speaking to myself here you need to do a few things and accept a few truths.
Commercial restoration is a fairly new endeavour in south Africa.
South Africa does not have the resources to supply a thriving restoration community yet and very few people have the knowledge.
suppliers buy the cheapest

cleaning and inspecting parts takes about 60 percent of the time spent during the actual restoration
Painting takes one day but the prep takes ages to do right.
Rust removal is never straight forward.
In my opinion the only way to keep a customer happy is to give daily updates photos and share your frustrations. Placing impossible deadlines will only get you shoddy work (shows like overhauling skews the picture> Who can afford to pay the amount of labour (skilled artisans) in those shows the parts get delivered and the cars are chosen for parts availability. I also like the customer to put his wants and needs on paper and will rather loose a customer because we couldn't agree on things than supply bad work.
I have also found that it is extremely difficult to price work according to actual time spent Eg My Puma had 13layers of paint which had to be removed by hand as fiberglass is easily damaged by more aggressive means. This took me almost a year of afternoons to accomplish (who would pay me for these hours as the same on the silwer beetle took only two weeks during the same hours worked.
installing those pesky trims on a beetle door can easily eat a whole day I can go on.
Hope this puts some perspective on recent posts.
Armand