It appears as if there was an agreement that you get commission for your design work (that's fine I think) .... its just that he owes you commission.
If he does not pay you commission then I think the employer would lose any rights to the work product until he pays you. Unjust enrichment.
You may be able to collect 100% of funds that the business obtained through the unjust enrichment.
Have no idea what type of design job it was (interior, mechanical, chemical, etc.).
They are going to have a hard time saying you got paid as you were an hourly employee that you only got paid for the non-designing time periods.
Stop using the term "salary" if you were hourly .. its "hourly pay" to avoid confusion.



