Just something to think abou for the exhaust downpipe, normally, you would want nice gentle bends, (like mandrel bent tubing) no sharp edges & have the tubing as big as possible.
Mine is not the greatest, I made the joggle to clear the steering box, it is smoother on the inside than the outside.
One problem I see, the oil drain line on turbo should not have the lower hanging section. It hangs lower than the conection to the pan. The oil when leaving the turbo is all frothed up and needs the easiest route possible to flow.