@raphaelmorgan Atha here. The idea that gene edits could only have much effect in the womb is a commonly held misconception based on the limited degree of technological advancement that has so far percolated into public awareness of scientific capability and possibility.
There are examples of the use of CRISPR, among other methods, to edit small numbers of genes in specific cell types in children and adults (some citations will be linked in a follow up reply on here when we can find the links for you).
What we intend to do is to build a simulation of the whole body (all cell types) to better enable the development of gene edits which, rather than being introduced in isolation from each other, or indeed in disorganised clusters, they will be built into custom designed gene editing vectors which unfold sequentially to carry out complex processes in such a way as works best with each individual patient's genome and characteristics, as simulated first before producing the vector with its complex payload for real.