Gum paste house (2-D standing)

Hi,
I am a hobby baker and new to this group.
I am making a cake that has a haunted house that stands up on the cake. I made this about a week ago and someone I know saw it and wanted me to do itfor her grandson. I had a difficult time with this house the first go round. I made it out of gum paste and let it dry for a day and a half but a few hours after assembly one of the towers broke. I had it pretty thin and support more toward the bottom and didn’t extend up far enough up. I fixed it and it looked fine but I wasn’t happy. Now with making this again I’m wondering if gum paste is the right option or should I use fondant with tylos in it instead. I don’t have lot of time. She picks up on Wednesday morning.
Thank you for all the help in advance.
Robin