Old Binoculars Low-poly 3D model

hello, i download the file. i'm a jewelry craftwomen and i want to use this Binoculars as a pendant. Yesterday, i went to 3d print company and told them to scale the item to 4cm lenght. they told me that when they scale to 4cm, the small parts cant be print because off the thickness like lens sides. They told me that the drawer of this file can arrange the thickness of the smaller parts. Smaller parts must be bigger then 0,5 or 0,6mm(50/60micron) for to print. is it possibler for u to scale the object to 4cm and control the thickness of the small parts when u scale it? And also as a pendant it is very heavy becaouse the binoculars of interior part is not emptied. For to use of a valuable metal it is very costly. when we try to scale the object 2,3cm hight , its weight comes 10gr. but i want to use it with a height of 4 cm as I want, but its weight should be between 9-11 g at most. can u please empty the interior part, make the scale 4cm, and control the thicknesses of the small parts ? i want to print the object and this problem stuck on my mind. can u please help me urgently? thank u in advance