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• The Main and crossmember tubes are specified as 1.75" OD with a .049" wall.
• The BB tube is specified as 1.625 OD with a .049" wall. With all tolerances, this be an excellent fit after painting.
• The sheetmetal bulkheads should be fabricated from 12 gauge, grade 30 sheetmetal steel. If grade 50 is used, the thickness can be reduced to 14 gauge. CAUTION- with the reduced diameter of the crossmember tubing the bulkheads will need to be changed accordingly.
• The pinch collet and pulley mount will be made of 7/16" OD with a .083" wall. This size makes it easy to tap a 5/16-24 TPI thread
• All seat tubes (yes, even the back tube) should use 5/8" OD tubing with a .049" wall. Again, this reduced diameter keeps the weight down.
• The stays and drop outs are off the shelf components that can be purchased from www.fairing.com or from www.novacycles.com
• Stays example http://www.novacycles.com/catalog/product_info.php?cPath=35_271_272_273&products_id=1522 These tubes will be used for both chain and seat stays.
• Drop out example http://www.novacycles.com/catalog/product_info.php?cPath=25_114_119&products_id=875
• Steel Bottom Bracket example http://www.novacycles.com/catalog/product_info.php?products_id=1500

Note
Two 1" diameter x 3" long crossmember tubes (1" OD with a .049" wall) are required to accomodate the stays, refer to this drawing: http://www.hellbentcycles.com/rear-end.jpg
Furthermore the ovalized stays may require rounding to accomodate this crossmember, as they are almost 1-1/8" wide.

Gussets are not required for steel construction, so although using steel almost doubles the weight, the absence of the gusset should help this handicap.

In the meantime, I will contact the Tube Service for pricing and availability. If I get enough interest, I'll offer tubing for sale. So far I have only two people interested. When I get 10, it might be worth my time.

This should get everyone started. I will be updating this list weekly if not daily until I have everything nailed.

As for making formal changes to the drawings, Absolutely NO. At this time I'm only redlining these drawings. The formal changes will be incorporated when I increase the price of the plans (I wasn't kidding when I said this was a limited offer). However, the price will remain at $35 until the end of July, perhaps even August.