I am thinking of putting a computer into a DMZ (Demilitarized zone) on my network and keeping it completely opened to the public. The router will not act as a firewall. Also, I won't make iptables configuration on it, but I will put some security features on it such as SELinux. Would anyone be interested in running BT2 software against that machine?
Yes, I was about to say that the first "hurdle" will be to prove that it's even your own machine, without the rest of the likely problems!
I'm not sure what your intentions are, with this exercise...
Maybe you'd find the Honeynet Project an interesting area of study?
If you set up a completely undefended machine on the net, I don't think you'll need to *look* for people willing to attack it for you!
Just to throw in my 2 cents. I would not feel comfortable attacking a machine across the net , through multiple severs and isp's on your say so.
For example: I am a slum lord and I own a block of apts. I make you sign a contract when you move in that states you will not consume any alcoholic beverages while on my property. You sign. Then next week I catch you drinking and I Kick you out. You get irrate and will not leave. I call the police you go to jail.