I haven't yet heard from Skatteverket, but I thought I'd have a look at my papers to see what I've paid already. The easiest thing to total up is VAT; it's shown clearly on every invoice.
Looking at the invoices I've kept (big ticket items like the house and labor, the bathroom, electrical wiring, helicopter, and smaller ticket items like the kitchen, furnishings, appliances, tools, stain, etc.), I've found about 285,000 kronor paid in VAT. Using the exchange rate at the time, that comes to about $45,000 (or £25,000).
Next, I'll add up taxes and fees paid to the kommun. But I need a stiff drink first!