Q:
Ascended Weapon crafting Q
No, you only can make it if you unlocked the corresponding recipe, you can’t use discover tab for ascended. Craft it, then you can change stats in mf, i think that would be least expensive option.
Also one sidenote: the statchange requires exotic inscription, not ascended.
http://wiki.guildwars2.com/wiki/Ascended_equipment#Stat_Changing
Also, the crafting vendor sells ascended recipes, if you haven’t put the inscription together yet.