Hello there!
My opinion on SwiftHawk models by now is: if you have then and wanna make an army, go for it but dont invest cash into the faction.
The reason i say that is because if Spire of Dawn models follow the Skaven way, most will be gone by the time a battletome happens (high warden, seaguard, reavers and possibly Swordmasters) since they are no longer sold by GW.
That said, the models are cool and the army will look great.
The battalion is indeed controversial and technically invalid in matched play, but if your local comminity is chill it wont be an issue.
Overall i am not gona lie, getting wins with it will be an uphill battle, since Swifthawks lack punch, rend and mortal wounds.
If i may suggest, why not go with Order alligeance? Reavers are Order Battleline, and so are Highborn Spearmen ( can use the seaguard to represent it). It will allow you to field Aelves things on the list to counter its weakness, such as a Punchy Dragonlord and resilent guys like the Phoenix Temple units.
If you insist on Swifthawks, i would advice on an Archmage on horse so it have speed to keep up with the rest of your army.