That actually seems like a pretty fair trade in price, since there are at least a few sitting at dealers that are asking around that price. Granted these are likely not as clean, but most dealers are just trying to flip cars rather than find the perfect rust free one and waiting for a buyer to pay top dollar.
Mods can add a lot of value, but the increase in price and desirability to pay for them is a really small market. It is just all about how patient people are and willing to hold something. I ballparks mods are worth 25-50% of the part price, with no labor costs. Resale just really really hard since a lot of people that wanted a modded LC also want to do the build their "own" way even if it is 95% identical to yours. "Pride" in the self build or whatever.
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