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Installing the XENIX 2.3.0d Development System isn't so hard.
Assuming you managed it to write six 1.44MByte floppy disk images back to real floppy disk media with success, you just have to enter 'custom' at the XENIX system prompt.
Then you have to choose '2' for Development System, '1' for installing one or more packages, and then 'ALL' for all packages. Be patient then, reading each disk will take a bit time.

Each disk contained a TAR file, which can be opened from any Windows machine with WINRAR also with ease (just open the image file of the floppy disk with WINRAR).

After all disks are processed, you have to enter the serial and activation code.
And last but not least, you have to decide what curses you want to use: termcap or terminfo based. Old skool people like me prefer termcap ;-)

After the system prompt reappeared, I tried to enter a small but famous test program.
But I could NOT enter the closing bracket '}' ... it's not available with my german keyboard. That's ugly, but because I had no time to figure out how to fix it, I just write the small text file in Windows, copied it to a floppy, and used 'doscp' to get the file into XENIX file system.

And it worked:

Remember - running the program without preceeding './' needs '.' to be added in PATH variable.
And without any cc option, the generated program is always named 'a.out'.

In one of the next parts, I will describe installing and using TCP/IP.

For a dev system manual, look at the related link below.

P.S.: I solved the problem with the german keyboard layout. You have to replace a file named 'keys' within the /usr/lib/keyboard directory with a modified version, then you have to run 'mapkey' one time. The modified 'keys' for my german keyboard can be downloaded >here<. If unsure, backup your original 'keys' file first before replacing it.