In the BulkBuy section, I said I would show a few pics of how I mounted my tool tubes. I didn't want to post a heavy post on there and take it off topic, so posting here. I'll post a link on the Bulk Buy thread to keep things tidy.
I made a bottom bracket to attach the two together and snap over the bottom chassis cross member, the big 1" round tube which runs sideways across the chassis, in front of the engine. It is retained with a single jubilee clip (The bracket located and holds it, jubilee clip is just incase a big bump would throw it up and off).
I then made a top bracket to hook over the top diagonal chassis rail near the expansion tank. The only reason it is pointy where it hooks over is simply because it was a bit of scrap I had lying.
http://my.lotussevenclub.com/Portals/14/UltraPhotoGallery/1206/240/large/DSC_0661.jpg
http://my.lotussevenclub.com/Portals/14/UltraPhotoGallery/1206/240/large/DSC_0662.jpg
http://my.lotussevenclub.com/Portals/14/UltraPhotoGallery/1206/240/large/DSC_0667.jpg
http://my.lotussevenclub.com/Portals/14/UltraPhotoGallery/1206/240/large/DSC_0668.jpg
http://my.lotussevenclub.com/Portals/14/UltraPhotoGallery/1206/240/large/DSC_0669.jpg
These two were filled with tools, spares and oil, and sat here no problem for 4000miles on our Euro trip. I had a third mounted as a lashup with cable ties, lying on top of the chassis to the left of the expansion tank (Towards throttle bodies). I was too ashamed to take pictures off it).
Benefits of having them mounted down low in front of engine is obviously keeping weight low, keeps the vertical for getting stuff out and keeps oil in radiator airflow, so at approx engine temp for hot top ups.
Disadvantage is that you need to take the nosecone off for access.
Willie