Perhaps consider your work so far proof of concept, now how about making it all wireless? all your sensors and switches/relays can be replaced with devices you can query via bluetooth or wifi.
an example of cracking a commercial temp/humidity ble product that runs on a AAA cell for 18-24mnths..
https://zsiti.eu/xiaomi-mijia-hygrother ... pberry-pi/
to turn on/off mains lighting or electrical devices there is a wide range of wifi enabled products, i am a huge fan of the sonoff brand when reprogrammed with tasmota
this also provides a framework for including additional remote sensors and h/w to either relay controllers in use or developing your own esp8266 based devices, for which the wemos D1 and its collection of sensor and h/w shields makes it more like leggo
a distance sensor for example: https://github.com/arendst/Sonoff-Tasmo ... nic-Sensor
I think you can find the ldr hook up yourself
You will need to learn how to do basic soldering, to solder headers to boards etc, its a skill that can take a little practice, but watch a few utubes and practice a bit to get the skills and confidence and your flying, an evening devoted to it should do ..
With a distributed set of sensors and relays publishing status and ready to accept commands from your pi you can focus on the system logic and interface presentation, and adding further aspects to the system involves NO service interruption while the pi gets rewired