Just wondering, is RTK recommended for people who can already recognize the characters, or is there a better way to learn how to write? Like maybe just doing it by rote memorization? I have a general idea about how all characters are supposed to look, I just can't really remember every radical. I was thinking about doing something cards like:

#訳
ほんやく
_________
翻

for each kanji. Maybe RTK is still worthwhile though? Maybe I do need mnemonics? Anyone else have experience with this?

I would either:

(1) Just go through a normal vocab deck and practice writing as you practice drilling your vocab, as discussed in this thread.
(2) Subscribe to Skritter, and use that for writing practice.

IMO, creating a custom clozed deletion deck is a lot of work. It's time that could be better spent studying. I'm a big fan of using methods that minimize grunt work and maximize studying. In my case, I collect words either manually or using Rikaisama, then simply dump them into my Skritter vocab list on a periodic basis.

When I started RTK I could already read ~1000 kanji.

I've found the effort to be worth it (nearly finished now), but it's also been a couple hundred hours that I haven't spent improving other aspects of the language.

It does make character recognition easier by a mile, and you'll certainly gain some benefit from it. I don't regret sinking the time into it.

There's a method here that I quite like the look of. I haven't actually done this, but when I eventually get around to kanji study I'm thinking it might be the way to go (or yeah - just write out stuff from my deck).
RTK doesn't do anything to associate the kanji with actual words, which I think if you already have a good vocabulary and recognise a large number of kanji you might as well do it at the same time.