Just an update, if anyone's interested.
I dropped off my Scamp at the Fabricating Shop that is a couple of miles from my house this morning. They will remove the old axle, install the new and wire the brakes/lights to the 7-pin plug.
I also asked them to check the frame at the bend while they have it on the lift. The owner said he will just go ahead and add some reinforcement plates while they have it in the shop, should be cheap insurance.
He guessed it should be done later today. I gave them Scamp's Service Department's phone number in case they have any questions regarding the install. Figured Scamp would be accommodating, since I bought the axle through them.
I also have a break away switch ordered through Amazon, but it won't get here until tomorrow, so I guess I'll install that myself.
Other than a new spare tire (current one is old and severely cracked with dry rot) the trailer should be good to go, and legal wherever I want to take it as soon as the weather gets nice. The current running tires
look good and are only 3 years old, so will be fine for now.