How to stay motivated on your project?

See we all get that way with our busy lives. Even I get that way, especially with 3 kids and their activities going on to, not to mention work itself. But every time I go outside and see mine sitting there and knowing those parts I bought aren't on yet, it bugs me till after a while I realize I am out working to get them on and enjoying bringing it back to life again. But before you know it and step back, then look .... WOW, its really coming along with what time I have only put into it.