The buttons in the corners will be P1/P2 start
The 5 admin buttons will be (in no particular order)
Exit/Quit
Menu
Coin in
Setup (F2)
Pause
P1 Start/P2 Start (1/2) Sobbing gently and banished to their corners all by themselves.

Exit/Quit (Esc)
Menu (Tab)
Pause (P)
Standard stuff. Looks good so far. . .
Only 1 coin button (5) means only credits for player 1. Will player 2 have to use tokens to load credits?
Setup (F2) - I can't figure out why this one is on the control panel.

Seems like a small Bluetooth keyboard stuffed inside the coin door opening would cover this on the rare occasions it is needed.
What FE and/or emulators besides MAME are you planning on running?
-- The answer to this question may change what admin buttons you want/need.
Also, since you placed an order with Andy, I'm guessing you are using either an I-Pac or a Mini-Pac. (Keyboard-type encoder instead of a gamepad-type encoder.)
-- Some emulators like Visual Pinball prefer keystrokes instead of gamepad button pushes, requiring you to use joy2key or xpadder software.
Scott