John personally i would stay as you are for now and complete what you started. I will almost guarantee that by the time you do complete this your thoughts will be completely somewhere else....A new build!

In most cases the size of the parts you think you may want to make in the future end up being smaller. After i finish my mill build i shall be making my router smaller. The reason for this is because i am just not using the whole thing and it is space i could do with back in my workshop.

The bigger the part you want to make lends itself more to being done manually i always find. If you happen to come across a larger table for a few quid then just buy it. It will save a lot of heartache in the end.