Trying to make a table with uneven cell sizes i have made

Question

Trying to make a table with uneven cell sizes. I have made the cells and 2 tables which I'm trying to combine into 1 table and then make borders around that table (and around the cells as well).

my code is:

Table 1

I have borders around the 2 tables, but don't know e cellshow to produce just the border of the whole table with borders of the singl