I've built a couple of Frequency Central kits, I could write better build guides, the one's I've used were vague and outdated and lack proper clarity for simple key bits.
Had my eye on that Stasis Leak though.
Enjoy your spare HP, don't rush to fill every last space, this is not like filling sticker books. Resist the urge to 'complete' your rack, its never complete so just relax.