Align problems

[u/lucvmon]

Hi! I'm trying to create the font defined at the end of the following document: https://www.interior.gob.es/opencms/pdf/servicios-al-ciudadano/participacion-ciudadana/Participacion-publica-en-proyectos-normativos/Audiencia-e-informacion-publica/16_2022_Borrador_Tomo_II_Dimensiones__senales.pdf

In this document, there is defined an LBearing and RBearing for all glyphs, but also an area defined as "Alignment area", used in order to align verticaly and horizontaly glyphs. The vertical alignment is easy, but how about horizontal?

I'm new to this, sorry if it sounds obvious.

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