You discuss it very much whereas I have heard Messenger of Allah ﷺ as saying: He who builds a mosque-- and the narrator Bukair said: I think he also said: (for) seeking the pleasure of Allah- Allah would build (a similar house for him in Paradise). and in the narration of Harun (the words are):" A house for him in Paradise." (Using translation from Muslim 533c)
أَنَّهُ سَمِعَ عُثْمَانَ بْنَ عَفَّانَ عِنْدَ قَوْلِ النَّاسِ فِيهِ حِينَ بَنَى مَسْجِدَ رَسُولِ اللهِ ﷺ إِنَّكُمْ قَدْ أَكْثَرْتُمْ وَإِنِّي سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ مَنْ بَنَى لِلَّهِ مَسْجِدًا قَالَ بُكَيْرٌ أَحْسِبُهُ قَالَ يَبْتَغِي بِهِ وَجْهَ اللهِ بَنَى اللهُ لَهُ بَيْتًا فِي الْجَنَّةِ