<rant>
After reading the news, I was ready to donate 200'000 bits but changed my mind after realizing that they want my physical and email address. For f***s sake, the whole point of donating with BTC is that it can be done in 10 seconds. I for one won't donate like this.
</rant>

I'm considering to implement an SPV client from scratch. Where should I start?

I've had a look at the following links ...

https://en.bitcoin.it/wiki/Protocol_rules
https://en.bitcoin.it/wiki/Category:Technical

... but it seems much of the information revolves around full nodes and isn't very in-depth to begin with.

Thanks!