Donate to GMCA Posted on July 26, 2018, updated on September 7, 2018 by chris $50 $100 $200 $500 Or enter your amount below. Please consider a charitable donation to Greater Michigan Construction Academy. GMCA is a qualified 501 (c)(3) charitable organization. Your donation is therefore tax deductible to the extent provided by law. Amount: Donate to GMCA quantity Donate SKU: donation Category: Donation