Hidden in HFSLIP was / is a nice feature that can save you ISO creators (like me) a good bit of time. It has now been documented. HFSLIP can make an ISO automatically! If you are NOT going to make an ISO or want to run nLite before making one, skip this.

1. Create a boot sector file from your Windows CD.
You need to extract a copy of your CD's boot sector using Bart's boot image extractor. (Or use Google, you'll find it easily).
Place original Windows cd into your cd drive
Open comand prompt
Type D:\BBIE.EXE E: (D is the drive letter bbie is installed on, E is the drive letter of your CDRom drive!)
A file called “image1.bin” will be created on your hard drive.
Rename this to BOOT.BIN and put it in HFTOOLS.

2. Download a Win32 build of MKISOFS.EXE from anywhere on the 'net.
You could get MKISOFS.EXE here too.
Put this file into HFTOOLS.
The reason I recommended the Min32 build in PMs is because some packages come with, and require, CYGWIN1.DLL also. If the one you find and download comes with this DLL, be sure to include it in HFTOOLS. It's just nice to have a binary that doesn't require an extra DLL, and if / when the guy sees a bunch of traffic grabbing this file, I am sure he'll move or remove it from his site (I wanted to be sure that the HFSLIP regulars grabbed a copy).

MKISOFS can be redistributed (we don't because there's no reason to make the download bigger when MKISOFS is everywhere on the 'net. The standalone Ming32 compile is rare though, and there's no source with it, and I don't want to end up being the only guy hosting it.

If HFSLIP detects both MKISOFS.EXE and BOOT.BIN in the HFTOOLS folder, it will create an ISO called WINLite.ISO alongside your hfslip_xxxxx.cmd file.

I was using the previous method (cdimage/boot.img). took me about 3 tries to realize someone changed something

Anyway, can I use the boot.img file renamed to boot.bin as I had downloaded the boot.bin per previous instructions.

sorry we threw you off NtegrA
yes, the files are indeed interchangeable. you may rename the boot.img file and it will work.
cdimage is "dormant" for now, to use sci-fi movie parlance until we figger some things about it out.