3 full size USB ports, a USB-C port (could it be Thunderbolt?), a 3.5mm headphone jack, and an SD card reader. All in all, Tom Nook’s laptop appears to have pretty decent connectivity options for a modern laptop, while still remaining relatively thin.
Well, I was using the USB port as a frame of reference, since obviously external size references in the game are unlikely to be consistent... to me it looks somewhere along the lines of X1 Carbon size based on that. Maybe smaller. It’d be easy to derive more from the texture.
Using one of the USB-A ports for scale, the base seems to be 1.2 centimeters thick-- which I guess is more than a Macbook Air, but certainly not "a tank", IMO. For reference, my 2014 Thinkpad 440p has a base thats slightly more than 2 centimeters thick, and my Minecraft FPS can corroborate that it was never much of a gaming laptop ;)
Power on the left back, headphones left front, lock right back. I've had multiple laptops from different companies with that same configuration (two of which are in front of me right now).
Connectivity like that is common outside the Apple world. See Lenovo Thinkpads, HP Elitebooks, most gaming laptops. It's the fashion statement computers like Macbooks that have remoted ports for no good reason.
I was mostly being silly, because I personally use mostly thinkpads, and honestly mostly pretty thick ones. However just to add: my current perception of thin laptops is mostly based off of Microsoft Surface devices rather than Apple devices. (I dropped out of that market after the 2015 Macbook Pro or so.)