Im new, am a 3D designer. Need a New cnc machine and need advice and guidance

[FlyHighRC]

Right, I have beefed up the gantry quite a bit now, Though the problem IM having now is difficult access...

As you can see from the pictures below, having mounted the block the ballscrew doesnt extend far enough so i though i could add a coupler than add some 6mm rod which will go on one end of the coupler and the other end, the pulley. Pretty complex way so unless you guys say thats ok ill scrap that idea... would also need to cut a whole in the vertical box section to be able to tighen the coupler