Congratulations!
Nice blog, was very interesting to read, really like it.
As about heatsink on the cpu - You can cut it with a carpet knife (just be careful, don't cut Your fingers)
About Kickstart - this wasn't smart, to be fair, sorry, there are much easier and cheaper solutions to get 1.3/3.1 KS, really..You can get an Eprom programmer instread of spending money on these expensive 2 in 1 KS and relocators, and You will be able to burn amy KS rom You want instread of spending 30+€ on each
And did You heard about early boot menu? Hold both mouse buttons and power on Your amiga, You can choose what media do You like to boot from DF0 or DF1 (external)...