I found this while surfing some random dreamcast site. It appears to be a rip of a devkit harddrive. In the folder dir4/c/image/root there are all the levels and a 0.bin which i beleive is the 1st_read.bin.  

Ive uploaded it to megaupload in hopes one of you guys can make it playable.  Thank you, have a great day!

http://www.megaupload.com/?d=TTYTGBLW