Since you have a detector, can you tell us a little about the skills involved in assembling a detector? Is there a How-To webpage that gives a reasonably clear and step-by-step description of how to go from buying the parts to getting a detector assembled and hooked up?
Sure.. the skills required to assemble are:
1) fairly good eyes (and/or a large magnifying glass) as the parts are small
2) soldering skills and a thermostatically controlled soldering iron
3) fairly good dexterity with small wire cutters and pliers.
If you've never built a HeathKit or assembled a printed circuit board, it can be a fairly steep learning curve. Some of the components are surface-mount technology and so are very small and easy to mis-install (been there, done that).
For ordering, you need to use the guide at
http://www.blitzortung.org/Webpages/index.php?lang=en&page=3 and send a message (via the website there) to Egon in Germany. Read the PDF file on that page which gives a bit of the history, the principles of operation of the system, and the details about the controller and amplifier board(s) you construct from kit-parts.
If you decide to build a system, the parts are available from Egon and shipped from Germany. The developers are taking a summer holiday in July, so won't be answering requests or sourcing kits until August, 2014. You don't have to be a radio amateur (HAM), but it likely helps because the components/terminology will be somewhat familiar. My degree was in Electrical Engineering, so it was no issue for me, but if you've never wandered around the insides of modern electronic devices, it may be a large learning experience.
Cost for a controller and H-field (magnetic) sensor/amplifier ran me ?206.04 (Euros) or about $281.84 at today's exchange rate. Payment is through PayPal, and you only need to order some of the kit, and source things like cables/wall-wart power supply locally (which saves a bit of money). I'm looking to order the new E-Field (electrical) sensor amplifier to add to my existing setup, but I'll wait until August to do that.
The most active discussions about Blitzortung, setup, operation, enhancement are on
WXForum.net and the internal Blitzortung forum.
Hope this helps...
Best regards,
Ken