You will need a small file to cut the 2xslots for the new switch.....a standard size file is just too big.
Rather than try to find a bullet connector plus spade connector to connect the new ignition wires to the existing ignition wires, I simply cut off the old connectors and did a solder splice joint on each and then heat shrink.
The amount of wire you have on the existing ignition wires is quite tight, so I removed everything including the cupboard shelf in order to gain some access. Rather than use cable straps etc for the wires, I simply ran the wires through the cavity that exists between the hob plate and the cupboard at the very top. I ran the wires direct to the new ignition unit, located where the original author suggested. No issues.
Initially I could not fathom how to remove the cutlery draw, but then discovered there are 2x handle beneath the drawer at the front. Simply press these and the drawer pops out.
I'm happy to provide any supplementary photos you may need to explain anything I have written above. Let me know.