You have a great idea , just might have to take it a bit further as likely you have equo and have updated equo tree so would have to look at /etc/make.conf as well as equo make.conf and laymans make.conf as well , heck check out all make.conf and make sure all of them is the same.
Likely layman is different from equo and from /etc/make.conf and this can cause a few
Then go about checking what is installed and how to remove excess , udept is one of the better ones to use "dep --help"
Also check lingua in make.conf as you surely do not need mandarin or urdu languages or ati / sis / intel video if you do not have the hardware and this causes more bloatware.
Actually ideally you would want to install core and then using equo build your system from there with minm. make.conf options same as gentoo handbook from scratch idea except you can use equo to safe a few days compiling.
This way you know what you want is there and is satisfied.
gcc , python , kde is always a pain in the ear so spend more time working and fine tuning them / latest versions with kde only if needed or wait till kde has a kde lite version without the bloatware.
Yes I am a kde fan but xfce or e17 or similar might do the job well enough + performance without KDE and the issues that goes hand in hand with it.
Def. worth a try especially using say 3.5 dvd + mod it so it pulls in updates during install same as gentoo online install does so use what is there and current + add latest from online during core install.
If none of this makes sense ignore it.