Thanks all for the quick feedback. It certainly helped. We had a meetup, only the 2nd one, scheduled for yesterday evening to discuss the project. Quite a bit of course correction was achieved.
As Oldscout448 brought up, I took a closer look at the BSA safety guidelines. For the scout's age, he is able to use a 'screwdriver (electric)', so that opened up doing assembly for him.
In the meeting, I told the scout, I'll wrap up the assembly model (was nearly complete already) and I'll pass on a pdf of the assembly model and an exploded view of the cart. The rest of the piece drawings and determining how much plywood, selecting hardware, is in your wheelhouse, as it is your project. I'm here for assistance and questions when you have them.
Also, dad brought up and asked if the scout could be here during the cutting. A definite change from him during the first meet. Told him, "Of course, he must be, its his project. He'll be the one prepping and lining things up to cut, I'll show him how. I'm here to do the things he cannot. Specifically, that's using the saw and router. This is his project, I'm here to assist."
Feel better about the direction its going now. Now, whether this is substantial enough for an Eagle project, I still question. Also, I did intend to ask for and look through his project workbook, however he didn't bring it to the meet. And one asked who contacted me first, it was the parent who first contacted me about this project, not the scout.
We'll see how it goes...
And I do recall this commercial, Mazda's "Dogs ... love ... trucks". What about it?! Lol
PS: For background, I was only in BSA for 3 years. Dropped out, as all we did were arts and crafts projects, since the den leader was a mom.