Horse Arena supplied to customer in Co. Longford, January 2015 by csmills | Feb 16, 2015 | Testimonials Timber Horse Arena Horse Arena – 24m x 48m Long. Materials Used: 2.4m 150 x 75 Larch Posts, 4.8m 100 x 44 Rails and 4.8m 225 x 44 Kickboard. Customer sent us this picture of the finished work & very satisfied with the completed Horse Arena.