You can get the bootable disc here:
Win3x_Bootable_Installer_Disc.7z
Here are some screenshots:
The startup menu. It features a boot from hard disk default option.

After you select the quick setup option a warning message will be displayed to remind the user that the current system files will be replaced, just to be safe:

If CONFIG.SYS and AUTOEXEC.BAT files are found, a backup is automatically made.
It also checks if a FAT16 partition is found, and if the partition is formatted.

The quick setup operating system selection menu:

First it automatically installs MS-DOS, along with CD-ROM and mouse drivers:

Then it copies the original Windows Setup files to the hard drive:

Rebooting after complete. You don't need to remove the disc if you select the boot from hard disc option at the next boot or don't do anything.

After restarting the normal Windows Setup will appear:

Notes:
- The computer will boot directly into Windows, similarly to Windows 9.x. If you don't like that edit the WIN.COM line out of AUTOEXEC.BAT.
- Some official updates are preinstalled (File Manager, Calculator, others).
- Windows 3.0 with Multimedia is a custom cleaned up version that doesn't include any third party OEM software. It behaves more like a stock Windows installation.
- MS-DOS 5.0a will be installed along with Windows 3.0 or Windows 3.0 with multimedia, although it still uses the MSCDEX.EXE, SMARTDRV.EXE, EMM386.EXE and HIMEM.SYS files from MS-DOS 6.22.
Alternatively you can ignore the quick setup option and use the other manual options to install MS-DOS 6.22 directly from the disc, and/or Windows.