The black frames are Open Beam extruded aluminum beam. I bought a kit years ago from Adafruit, https://www.adafruit.com/product/1275 I’ve bought more brackets for it, still have some of the beams left over from the original kit though. The bread board rig is portable enough that I can take it out on my deck in the summer to tinker with. The Pi foundation touch screen worked out well for that rig. Just big enough that I don’t get eyestrain using it but small enough to not make that rig too big to move around. No having to have a separate power pack for it either.
The sense hat shows the Day, Date, Time, Temp, Humidity, Barometric Pressure and UV index in a continuously scrolling message on the LED matrix. I call it my portable weather clock. The different elements change color based on conditions. The temp reading will change to Blue if the temp is below 0c. for example. and Red if its above 25c. Green is good, Yellow not so much and Red is bad. I use a SI1145 light sensor to read the UV index. I also use the ambient light reading to adjust the display brightness automatically. In a dark light conditions the LED matrix switches to low light mode and the secondary display with the 10mm LEDS is turned off. In normal sunlight the display goes to normal brightness and the 10 mm LED’s are enabled. In very bright sunlight some colors are hard to see, Red and Blue especially, so I toggle all text to bright white which is easier to read in bright sunlight. The 10mm LED’s I can use for what ever I want with an edit of my python file. Right now I use them for a quick Temp display. The Blue LED is on if the temp is below 0c, Yellow if above 0 but below 13c. 13 to 25 is Green, and temps above 25C turn on the Red LED. I can override the auto light selection with the sense hat joystick. I also use that to turn the Pi off. I added a DS3231 RTC board to that so it keeps accurate Time without an Internet connection. I used a Pi A+ as it draws less current than the 3B does, and is smaller. It didn’t need to be any bigger than the Sense Hat. I could have used a Zero but already had an A+. The A+ ia also easier to mount to the back of the sense hat. All the mounting holes line up perfectly.