This time around I have managed to get all my needed pieces in just two orders which has kept the postage really low! I discovered the LEGO Bricks and Pieces website where I managed to get most of my bricks like 72 1x4 dark blue bricks which only cost £13.49. The thing which I like about ordering from Bricks and Pieces is that the postage is only £2 and all pieces are in new condition. It also saves time because although some pieces may be cheaper on Bricklink, it is easier and saves time and postage with just doing one order from Bricks and Pieces with one postage cost. All together the Bricks and Pieces order came to £19.59 including postage.
My second order which was from eBay only consisted of 6 1x1 dark blue bricks because Bricks and Pieces had them 'Out of Stock'.
All together the total parts cost for this section of my project is £18.88 with a very small postage cost of just £2.19! This makes the total cost £21.07 for this section. So far the project as a whole has cost me £62.32 including postage.
From now on my project is going to get expensive with two white hoses needed which cost about £8 each and a door which costs around £5. You can see images of the project so far below: