Metropolitan Council Chairwoman Susan Haigh on Monday stuck by her group’s recent analysis that a 2015 timeline was a “little aggressive” for building a Vikings stadium in Arden Hills.Haigh also said it’s not clear if Ramsey County has the tax capacity to raise its $350 million contribution to the proposed project.Her remarks came during a lunchtime pep talk of sorts on the construction of the Central Corridor light rail transit project and other topics. Nearly 100 business and civic leaders attended the luncheon, which was held at the Goodwill-Easter Seals headquarters in St. Paul.The location for Haigh’s presentation was pertinent: The Goodwill site is at University and Fairview avenues — the heart of Central Corridor construction.“It’s a big, messy, complicated project,” Haigh conceded. But she urged those in attendance to keep their eyes on the prize: a completed LRT system that is intended to connect an ever-growing part of the metro area.