Use unfinished lining leather,it should be soft and feel fluffier( for lack of a better term ) than the outer leather. Top leather should never be heavier than the vamps. 3 to 4 oz chrome tanned lining , I use what is called cream cow made to use for vamp lining, works well and absorbs moisture. Just make sure you use a good veg tan insole leather. The heavier the outside leather the warmer the boots.
As far as no glue between the lining and the the outer leather I was referring to the vamps. Good luck.
Frank