David,

I have a DP Spitfire kit, too, and I can tell you that the complete kit originally sold for $439. This would be for the wood kit and the accessories together. Sadly, Dave's retracts weren't the best so the price on those might not be what you spent for them. (I bought a set of Robart retracts for my Spit.)

The Platt complete kits haven't been offered in quite some time and each should carry an added value as a result. If everything is in good shape, I'd offer the kit and accessory pack for auction on eBay with a minimum bid of your choosing and see where it goes.

Good luck, David. I hope this helps.

Al