Here are a couple of snaps of my LogiKey CMOS4 kit from Idiom Press. It was a joy to build and it is a FB keyer. It was one of the easier to assemble kits I’ve fooled with, and the supplied instructions are detailed and complete.
This keyer is also available fully assembled. In my opinion, soldering the kit requires a fine tipped soldering pencil. My smallest soldering iron was almost too big, but with a magnifier and bright lighting at hand, I muddled through.
I’m very happy with this little project. My Eham review will be 5-by-5.
The kit of parts and the keyer board : 
My assembled Logikey CMOS4 kit with the hood up: 
Except for the lid operator, ready to go: 
Nice subject!
I agree with your advice for a soldering iron.
I just finish my two C-MOS4 keyer kit last month.
It works very well, 100%.
Best 73
Thank you. Good luck with your keyer. May it win you much DX. I am still enjoying mine, it is very smooth.
73 de w4kaz