Radxa ZERO 3W OpenWRT

About to purchase Radxa ZERO 3W

Questions:

  1. When OpenWRT installed
    does it support repeater mode?
    I mean wireless client and wifi access point at the same time?
  2. is it 2.4ghz or 5ghz or both
  3. The openwrt firmware needs to be direct download from https://openwrt.org/
    or it is custom built by radxa?
  4. following case fits for radxa zero 3w?
    https://bit.ly/3BWQJVg
  5. Does Radxa zero heats up after longer usage?
    I want to keep it turned on 24x7x365 under room temperature 35degrees