Well, if your using fdisk then do not enable large drive support. This makes fdisk use Fat32 for a filesystem.
As far as NT bootdisks...
From the i386 folder setup.txt file...
Creating Windows NT Setup Startup Disks
=======================================================================
If your Windows NT Workstation or Windows NT Server Setup floppy disks
become corrupted, or are misplaced, you can create a new set by using
Winnt.exe or Winnt32.exe from your Windows NT Workstation or Windows NT
Server compact disc. These disks can be used to start Windows NT Workstation
or Windows NT Server Setup, or can be used with your Emergency Repair Disk
(ERD).
Note
You can create these boot disks from a computer running MS-DOS, Windows
version 3.1, Windows for Workgroups, Windows 95, Windows NT Workstation, or
Windows NT Server.
To create Windows NT Workstation or Windows NT Server startup disks:
1. Insert the Windows NT Workstation or Windows NT Server compact disc
into a CD-ROM drive.
2. From the MS-DOS command prompt, change to the CD-ROM drive and the
correct platform folder (for example, \I386 for x86-based
computers).
3. If the computer you are using is running Windows NT, type:
winnt32 /ox
at the command prompt, press Enter, and follow the instructions.
If the computer you are using is running MS-DOS or Windows version 3.1,
Windows for Workgroups, or Windows 95, type winnt /ox at the command prompt,
press Enter, and follow the instructions.
Good luck