Advice and etiquette for building up collaborations
You sound very optimistic that having met a senior colleague at a conference and having a desire to work with them, will automatically lead to a collaboration. You should consider that they may have other constraints on their time, and may not be able or interested to engage in more collaborations. 

Before jumping into the details such as travel arrangements, you should first find out whether they are interested in a collaboration and, if the answer is yes, how they would like to go about it.