Ok maybe its a down under thing 3 types of flutes top sewin.
Back sewen wich means the stitching is not seen.
And back sewen and filled where the vinyl is stithced to the backing material then foam is inserted into the pocket that is created using two strips of alloy then the strips are removed to leave the foam filling the pocket.
I will try and find some examples and maybe a translation for you on terminology.
I have had some bad experience with seat heaters removed the leather cover to find they had almost caught fire scorch markes all over the cushion so the customer had me remove the heaters and repair the foam
I tend to use the old cover to give me a ballpark shape then kind of shape it on the seat.
Or if i don't have that i use calico or scrap vinyl and mockup it the use the mockup as a pattern.
Yep perimeter stitch then stitch in futes or patterns i also back every thing with calico.
Just a habit i think it looks nicer than relying on the ceracks backing of the foam
You need to work out costing of time eg what you need to charge to keep the doors open so things like lease, utility's matainance of equipment.
Break it down into say a 40hr week (we wish).
So you take cost of rent+power and divide that by 40 and thats just keeping the door open and lights on.
I have done a similar thing with gym equipment weekend or overnight so as to minimise equipment downtime.
And the patrons are hard on the gear so reoccurring business.
We do our best due to the difficulties only the dedicated survive in the industry.
If you don't have the drive and passion for your craft then you usually pick another trade.