[pups] Bootable media for 2.11BSD

I think I've done enough homework and legwork to feel like I can ask the list a question now. :-) I've acquired an 11/73 and want to install 2.11BSD on it; it includes a TK50 and RX33. I also have a DECstation 5000/200 with a TK50, so my first efforts were to dd the files onto a tape. Depending on how I hacked around, I either got a "non-bootable media" error or "Error 21 - drive error". The two ways I tried to put the boot files on were per the instructions (cat mtboot mtboot boot | dd), and not per the instructions (dd mtboot, dd mtboot, dd boot). Depending on how I hacked around, I either got a "non-bootable media" error or "Error 21 - drive error" from the boot ROM monitor. With no way to troubleshoot the TK50 drive, I then tried to put at least a boot sector on a 1.2MB floppy, using rawrite on a PC; I copied mtboot + mtboot + boot to an intermediate file, then used rawrite to put that on the floppy. I got the same "Error 21". The machine also has a working RD54 containing Micro/RSX and some proprietary software for managing a parking lot. :-) I can boot to an RSX prompt (although I can't log in, having none of the passwords), so most of the machine appears to be working. While there's a stubborn side that wants to figure out how to build bootable media :-) I'd also be happy at this point to get a copy of a bootable TK50; I have blank tapes.... Either way, I hope someone can point me in the right direction. Thanks in advance -- Ian