This (halve) part of of the church is still in use as a church. The organ (first one build in 16430 ) has been many times rebuild and restore. Last time in 1980. Now it is a concert organ and use often to give concerts http://www.grotekerkgoes.nl/
A great picture of this beautiful church. Thank you, Ferry to adding the link. some wonderful pictures and I enjoyed listening to Willem Van wonderful performance of "Eine feste Burg is unser Gott".
Ian