>>6283123It's best to build it and make sure all the pieces are there asap so you can message the seller and let them to find out what they plan to do about it, giving the pieces time to get to you if that's what the seller offers.
You could inventory the pieces instead (go to
Brickset.com for the list and quantity of parts - Lepin manuals don't have an inventory in the back like LEGO manuals)
If you plan to spread out a large build and actually enjoy it.
There is another option when a seller sends an incomplete set: let them know, and through the 'dispute' option, negotiate a refund so you can replace the missing parts yourself by purchasing the original LEGO parts from BrickLink.
Try for a big refund (like 80%) and see how much the seller is willing to come back with, AliExpress are super on side with customers more than sellers, you'll be more than fine.
Hope this helps :)