Abstract: A method of designing a modular cooling tower cell which may utilize mechanicals from a preexisting cell and assembling the modular cell within a cooling field in-situ using a series of custom modules. After collecting a data set from a preexisting cooling tower cell and removing the preexisting tower, a build specification is generated, including calculating a cut list for vertical and horizontal members which will form the basis of the plurality of modules forming the cell. The members are fabricated and include a plurality of connection points which allow for sizing adjustments without affecting the connection points. The modules are then constructed using the data set from the preexisting tower to form a plurality of modules comprising a cell matrix based on the data set from the preexisting cooling tower cell.