One thing also you can do is I glue one side of sheath and matching welt, when it is almost dry I align them together. I then use a small square faced hammer and hammer with over lapping blows. I then glue other side of sheath and welt then when ready apply them together. I hammer again back...
I start with a 50 grit then 120 then 400 grit pre heat treat on 154cm. AEB-L post heat treat I do 50,120, Trizact A65 then A45 and hand sand. Damascus I do A 30 pre etch. On 154cm after heat treat I do 120, trizact progression again.
I sand with an 80 grit belt then use an edger for the corners. I dampen the leather then rub with saddle soap to smooth , next a hard plastic piece to rub to smooth.
Then you are advertising in the wrong market and you are using a sheath maker who your need to do a search for a less expensive maker. You can make all kind of excuses about why not to do it.
Evidentually you don't know how to price your knives or the values of nice knives. A Knowledgeable maker passes costs onto the buyer and both come out ahead.