Wow. You are golden then.
Theres the flipper board / upper left (pinled sells these - check ebay - 100 or so not bad)
The main driver board (300? Pinled or rotton dog either way).
The power board (where the batteries go / lower left) maybe 150 or so?
Sound board(s) - not sure if one or two - not sure of price - they sit above the main driver board / upper right - figure 100 - 200.
Yeah, go all in for these and you will be ahead of the game. Check mr pinball for the rest of the boards.
You can get the "new" boards from Pin led / rottondog or get used ones, probably save yourself a few hundred overall. I would just go with the new stuff (price them out first), either way you have a 3k+ machine for 2k or so.