I'd like to build a homebrewed tablet-style device that can run an Ubuntu-ish OS pretty well. The easy solution for a DIY computer is the Raspberry Pi, since it has reasonable power and supports myriad customization, but it's too chunky for what I'm planning. Here's my wish-list of requirements:
- Thin overall architecture - I'm thinking about 1/2" thick at most, and less is better
- Around 1.2GHz processor or better - I want it to be able to run a light GUI with good responsiveness, not having to constantly wait for input to get recognized
- 2GB of RAM would be great, obviously more is better
- Micro SD slot for OS (onboard memory for the OS would be fine too, as long as I can expand it with a card)
- Ability to attach a simple touchscreen - I can flex on this, if it can run a screen but can't do touch then I'll deal with it
- At least one free micro USB port - I'm flexible on power options, as long as it can be charging/powered while having a free port
- Built-in wifi (preferably also Bluetooth)
- HDMI-out would be a bonus but isn't required
- Low-budget is preferred since I'll be building a lot of it myself, but I'm willing to spend a couple hundred if something really fits the bill
I'm expecting to have to do a lot of modification myself, and I'll be designing my own case (unless there's a commercial one that suits my needs). Pretty much what I'm hoping for is a slimmer RPi with the same power, just fewer ports. I know there's the Pi Zero W but its significantly reduced power and memory are too constricting. What other options are there?