There are a number of us tinkering with scratch builds, special mods or drop tops.
I thought it might be an idea to post links to some specialist Wood Suppliers. Some of these may be known to people, some may not.
https://guitartimbers.com/ - Maleny QLD (Have yet to personally use, but it will happen. Damned Igor!)
http://anagote.com/ - Marrickville, NSW (Wide selection, will cut specific lengths, GREAT SCRAP BIN!)
http://crescenttimber.com.au/ - Annandale, NSW (an actual lumber yard, great stock but you have to buy whole lengths)
https://www.ebay.com.au/str/maxsawdust QLD (eBay Store, but quality stuff, I have used for a while now)
https://www.curlytimbers.com.au/ - Daylesford VIC (I have bought through their eBay store, some very nice stuff)
http://www.wheelerguitars.com.au/ - Botany NSW (Neck blanks, drop tops, binding etc Very Helpful and hugely knowledgeable.
Feel free to add to this and provide vendors in your part of the world, lets add to the hive knowledge!