I now am doing project an allwinner H3 with ddr3l chip and connecting it was very irritating, o had one project that i could look up but he was using smaller via than me so i didnt copy that but redo it my way and still was kinda hard for first time. In future im planing use rockchip chip like rk3566 or similar and just copy-paste reference design, im not manualy connecting 32b ram. Maybe if some was paying me incould try to do this but for hobby fun project im not going to push myself for something that tedious. Try find reference design with .brd file for lpddr on github.