I’m glad it’s working out.
I’m late to the party but I am also a multi boot geek.
My very first home computer was a Micron 100 Mhz system in 1995. How far we’ve come! On that system I dual booted right off the bat, ao that’s my bias. I bought books, read online, studied and didn’t do anything until I was ready.
Then I partitioned the system and had Windows For Workgroups 3.11 on the pre installed configuration.
So I made sure that it was in a continuous area, and I installed Slackware.
I also updated Windows to “Start Me Up” Windows 95 shortly after getting it going.
It all worked but I had to find a more up to date Slackware video driver. I did so, retrofitting it to the installed system and almost doubled the screen resolution and tripled the number of colors available.