I have made a dormouse before but never a rat, made on a Stuffed Panda Studios resin head base with the entire eye area taken out and modified to have a wider range of vision and to fit a more real/semi real eye style vs anthro, also uses her jawset and tongue. The claws are from DVC and are their unique "quick" claws which are suburb for a rat.
The pink frosted fur of the ears and digits took me ages and ages to find, as did the pink of the tail which with overseas shipping was really expensive and took over a month to get here but it makes for an amazing looking scaly tail <3
The eyes are carefully cut down clear acrylic Xmas ornaments painted black on the inside, extra wide mesh viewports for better vision as the owner wears glasses, fan cooled inside, whiskers cut from a fiber optic light up, hand painted palms and inner ears as well as blending on the face, beanbag filling in the tail gives it a most excellent wiggle <3
Also made but not shown are white sleeves with gray shoulders, and white leggings.

This rat was a commission and is not for sale, but I have a DVC rat base in the mail and I plan to make a toony blond and white domestic rat premade for sale later this year :)