Guild Wars 2

Is there a site that adds up all the costs in precursor crafting yet? I’d like to see which ones are still worth making, or have prices pretty much stabilized around the ones that were above their market value already?

gw2bltc.com should have all of them, unless if their collections are still bugged, i attached a screenshot from the colossus.
You can decide, wheter to use buy order or listing prices for the ingredients.
Also make sure to select how you would like to get the time-gated items (TGI), either on sell (S), buy order (B) or crafted on your own ©, as it makes a mayor difference in the cost calculation.

Mega Skeleton.8259:

Is there a site that adds up all the costs in precursor crafting yet? I’d like to see which ones are still worth making, or have prices pretty much stabilized around the ones that were above their market value already?

I doubt the prices have stabilized — there are still people in a buying frenzy to have their precursor now and the required mats (and other items) are still trading at a premium.

I’d argue that, for the next few months, it’s unlikely that any are more “efficient” to make via collection/crafting:

• buying precursors on the TP is simple and it’s easy to sell the high-demand mats
• building a precursor takes time & effort, so even if you have the materials, it will cost you in other ways

So I’d recommend crafting if you find it fun to do it yourself, but direct purchase if you mainly want the legendary unlocked for yourself.