I thought it was DP Firebird at first glance... I dug an old magazine out and indeed it is a DP Firebird...i am sure
I am not sure on the forks though, they may be tange trx... Wolfybmx has Firebird forks for sale on this site...PM him and ask him for a picture... or you may find them in the For Sale section
Nice find m8... quite rare.
Here is a piccy of one in action and the dimensions so you can get the tape measure out to be sure