Trim's psyched that he finally finished the fortifications, so he rushes to bring them to Toby. If the door opened quietly, he'd have seen the two men asleep and gotten the heck out of Dodge.
Instead, it woke them, and Mr. Shandy is horrified to find out that Trim had destroyed a family heirloom to make the models. Toby offers to shell out some dough, prompting Mr. Shandy to launch into a lecture on the expense of his hobby.
But Toby is willing to pay any amount, as long as it benefits the nation.