@gibbo675 I don't bother with labels, As for opening boxes, If someone else has done the hard work and you feel the price is acceptable then so what,
To make those models your own by adapting what comes out of said box is an art.
No less so than starting with a piece of Plasticard or a Brass etch (whether built as originally designed or adapted to be something else.)
Rule 1 applies in every case IT'S YOUR RAILWAY so do what you want.
RULE 2 is an afterthought, You can't have too many loco's, It's just that the layout;s not big enough yet!