sounds a bit to high. Yes you can do progress payments. Also buy safety gear like masks and welding eye protection Leo and Chang too. Also your partner might cook food for workers too.
Taxation wise I'm unsure but there are always ways to minimise tax.
but there's many reasons why the refuse. The OP has a letter that states the exact reason why his/her application was denied. Also I have not heard of a person being denied if they have a SPONSOR.
I've done 6 or 7 successful Australian Tourist 600 Visas up to 12-month durations since 2013.
yes you can. Fang also from Buriram has been many times. Did you do a SPONSOR TOURIST 600 VISA? That's very important. Pm me if you need help. First one we did was through Siam Legal all others I did myself. Why was your application refused?