Raspberry pi handheld computer

This is my first attempts to create a raspberry pi handheld computer,
to build this, i will need:

1 raspeberry pi 4
1 3.5'' touchpad display (https://www.aliexpress.com/item/32609751923.html?spm=a2g0s.9042311.0.0.46324c4dJyYeWs)
1 mini wireless thumb keyboard (https://www.aliexpress.com/item/4000083821318.html?spm=a2g0s.9042311.0.0.46324c4dJyYeWs)
1 4000mah lipo battery: https://www.aliexpress.com/item/33053078174.html?spm=a2g0s.9042311.0.0.46324c4dJyYeWs
1 powerboost 1000c to charge the battery and power the rasperry pi and the keyboard : https://www.aliexpress.com/item/32881790567.html?spm=a2g0o.productlist.0.0.1d03a9868jGpvf&algo_pvid=239902d8-e119-4d54-a025-cb6f5f60bd1f&algo_expid=239902d8-e119-4d54-a025-cb6f5f60bd1f-0&btsid=852004de-9626-427f-91da-605b84a0266a&ws_ab_test=searchweb0_0,searchweb201602_10,searchweb201603_55
1 power switch : https://www.aliexpress.com/item/32954387518.html?spm=a2g0s.9042311.0.0.46324c4dJyYeWs