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OK, not exactly a Boeing concept but here's a good place to start:

http://www.secretprojects.co.uk/forum/index.php/topic,3754.msg29436.html#msg29436

Then there's this thread:

http://www.secretprojects.co.uk/forum/index.php/topic,9631.msg88380.html#msg88380

And some discussion of large solids here as well:

http://www.secretprojects.co.uk/forum/index.php/topic,13823.msg135590.html#msg135590

Try our forum search engine too. Probably get plenty of hits.