This is the fifth document in the series about the development of LUATEX and MKIV, but here we focus on LUAMETATEX instead. It is a relative small set of progress reports that describes the steps to get there. This engine is a follow up on LUATEX, the engine that is used for the CONTEXT version tagged as LMTX. While the functionality of its ancestor is more or less set in stone, so that it can be used in other macro packages, this follow up permits further experiments in CONTEXT.