"I am no Verditius, so enchanting items is not a specialty of mine. But opening it for enchantment is something I should be able to do, although that will be the biggest item I have opened." He thinks for a moment, before saying, "That would require, what, 24 pawns of vis to open?" He nods, "I can handle that."
((Opening cost: Hard stone (4), Huge x10 (x6) = 24 pawns of Vim vis.))
"Animating the statue should be relatively easy. A Rego Terram effect, ideally with a Muto requisite so that the stone flows as if it was flesh, preventing any cracks and allowing it to resume its shape if it is damaged." Some more thought, "Hmmm... I can probably do this in a single season as well, as a sixth-magnitude enchantment. Guidance would as for a horse, I think, through its reins and stirrups. Having an experienced horseman available during the enchantment process might make things easier for that."
((ReTe base 3 (control dirt in a very unnatural fashion), +1 stone, +2 size (up to 100 cubic paces of stone), +1 Muto, +2 Sun = level 25 effect. Enchantment level is +1 for 2 uses per day and +3 for an environmental effect (to get constant use) = 29. Thus 3 pawns of vis.))
((I'm guessing that this might not need an Animal requisite for the guidance part, if the statue can be "trained" during enchantment to react as a horse would to the motions of its rider. So guidance would be based on the Ride score. If an Animal requisite is absolutely necessary, that may mean taking 2 seasons to enchant that effect.))
"True flight would be somethat harder, but simply Rego Terram, with no requisites. Probably a seventh-magnitude enchantment, so another season of work." He glances at Fiona, "Unless you'd want to restrict the use in some way, to prevent it from being stolen? That might be pushing things to the limit, but would probably be manageable."
((Again a ReTe base of 3, +1 stone, +2 size, +1 Conc, +2 for speed (as a running horse) = level 25 effect. Enchantment level is +5 for 24 uses per day and +5 for an item that maintains concentration = 35. Thus 4 pawns of vis))
"Those would be the basic effects. Anything else, you may be able to add over the years."