Apply a coat of primer to the wood surfaces with a paint brush, and allow it to dry overnight. Apply oil-base or latex paint with a paint brush. Do not paint the glass or silicone. Let the paint dry thoroughly. Finish with a coat of polyurethane, varnish or lacquer. Let it dry completely.
The size of the prey depends on mostly the size of the crocodile. Young hatchlings generally feed on smaller prey, preferring small fish, frogs, insects and small aquatic invertebrates before taking on larger fish, amphibians and small reptiles.
So how much does an adult crocodile actually eat? I think relevant other questions in this context are: Do all adult crocodiles (or even all crocodilia) eat roughly the same (corrected for body mass)? Some crocodiles apparantly eat fruit and seeds on a regular basis*, is this is a relevant part of their caloric intake or just a vitamin supplement?