[cctalk] Looking for bootable floppy image for a PDP11/20

I'm in the process of restoring a PDP11/20. Here is what is working so far: KA11 PDP11/20 CPU , power supply, programmer's console, etc. 32Kx16 SRAM/ROM board of my own design (Core memory will come later!) KE11-A Extended Arithmetic Element RX211 controller with RX02 drive, cleaned, spindle bearings replaced, aligned, tested, and working DL11-W Serial Line Unit with Real-Time Clock DL11 2nd serial port, modified to operate at 19,200 baud VT100, connected to the DL11-W I've written a program that lets me load a raw disk image (via Xmodem protocol) from the serial port onto a floppy disk, and verify the write. This works great, for both single-density and double-density. (It can set the media density as needed too.) I'm now looking for a bootable RT-11 floppy disk image (just a raw image, e.g. .IMG) that can boot and run on this limited hardware. The file should be exactly 256,256 bytes long if single-density, or 512,512 bytes long of double-density. (Actually, anything bootable on this hardware would be appreciated!) I'm new to this forum - let me know what is the protocol for giving you my email address... Thanks! Martin E.