Roberts build/respray, any tips for paints etc

Just picked up this frame on ebay and planning a slightly mad project. If anyone can give me any tips I would really appreciate it as it's my first paint job. Resources I have near me:

• Proffessional artist's fabricators/painters, going to ask their advice on the painting
  
• Car spraying place, does touch up work for people following crashes, specializes in bodywork
  
• I work in a workshop with lots of spares/second hand parts to try from
  
  

What I am thinking of doing is:
1) Getting the frame sandblasted (if anyone knows a good cheap place in south london that would be great)
2) Doing a 4 colour spray in the style of the table runner shown
3) Building up with sweepbacks as a 2x9 with V brakes
4) Fitting guards and rack and kickstand to make a dream do everything bike, my current one is a 17.5kg rockhopper. Rides like a dream but weighs a ton

Any experience/threads about spraying at home would be great, especially good top coat/lacquering options that are reasonably tough. My current plan is to use washi tape to mark out the shapes between colours once the coats are dry, I have never done this and I'm worried it will crack the paint when I take it off.

Thanks and I will do an update once the frame arrives.

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