That puts the PCB without art that sold on the Shmups forum for $1200 on the pricing high end, but it's not a board that you see often, so of course the price will be variable.
Given the condition and materials that your kit has, $1000 - $1200 ballpark seems about right IMHO.
Please give me a heads-up if you decide to sell it.
I did a stream with it last night.
Fast Forward to the end of Hyper Duel where i show the PCB.
It's literally a mirror and reflects my TV clearly it's so impeccably clean. https://www.twitch.tv/videos/558468699?t=00h35m16s