Question About Changing A Weapons Size with Magic!

[Arch Fline]

So here is a bit of background. My medium sized character uses a +1 Cold Iron Longsword as its’ main weapon. However I would like my weapon to deal a bit more damage at base without using magic, so I would like to make this weapon one size category larger and apply an Effortless Lace to the item to deal with the penalty.

The wondrous item known as Iron Lord's Transforming Slivers would allow me to make this change if I drank a enlarge person potion, and while under the duration of the spell, poured the pouch out onto the blade and left it over night in a Forge.

What I want to know is if I can simply use some Cold Iron bars with the weapon and a fabricate spell to net the same result. The Transforming Slivers site Fabricate as the primary spell used in its crafting so I wonder if I can effectively simplify the process if I have the spell being emulated. I would like a rules based response if such a thing exists for this unique interaction.

[Fuzzy-Wuzzy]

No, that would constitute transmuting the magic weapon.

Fabricate wrote:

Creatures or magic items cannot be created or transmuted by the fabricate spell.

The spell prereqs for a magic item have little or nothing to do with the functioning of the item, really. They're for balance and flavor, and are often very forced.

[Arch Fline]

Fair enough, however I could then use fabricate to change a Mwk Medium Sword into a Mwk Large Sword using Fabricate. I suppose that is enough for me, I can always use slivers for magic items.

[blahpers]

You could, but you'd need to make the appropriate Craft check since a masterwork weapon requires a high degree of craftsmanship.

[Arch Fline]

Indeed, those observations where already taken into account. As this effort would be conducted on an intelligence based caster I can easily meet the requirements to craft most mundane items.