To describe the bits of wood holding up the wall above several openings as lintels is a bit of an exaggeration. Some of them are only
2cm thick, and all of them are seriously bowed. Removing them is going to involve a fair bit of collapse of the wall above, the construction being mud and stone. The walls in question are all at least 2' thick. One opening is a window, one an external door, and one an internal door.I'm not quite sure what to replace the lintels with. More bits of wood, or several concrete lintels. This is one job I'm not looking forward to!
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